Program of the Sessions Denton, Texas, May 19–22, 1999

Onesimo Hernandez-Lerma, Wednesday, May 19 CINVESTAV Meeting Registration Guillermo Ferreyra, Louisiana State University 3:00 PM – 6:00 PM Lyceum Lobby, University Union 8:30AM Recent progress in characterization theorems in (2) white noise analysis. Preliminary report. Exhibits and Book Sale Hui-Hsiung Kuo*, Louisiana State University, Nobuhiro Asai, Nagoya University, and Izumi 3:00 PM – 6:00 PM Silver Eagle Suites, University Union Kubo, Hiroshima University (944-60-147) 9:30AM Markov control processes with average cost criteria. Opening Ceremonies (3) Onesimo Hernandez-Lerma, CINVESTAV (944-93-143) 7:00 PM – 7:30 PM Lyceum, University Union 10:00AM Stochastic Approach to Estimation Problems for (4) Some Differential Equations. Erdos Memorial Lecture Pao-Liu Chow, Wayne State University (944-60-109)

7:30 PM – 8:30 PM Lyceum, University Union Special Session on Functional Analysis and Its Applications, I

I (1) Paul Erdos˝ and his favorite problems in number theory. 8:30 AM – 10:20 AM Room 210, Wooten Hall Ronald L. Graham, AT&T Labs (944-11-417) Organizers: S. Perez-Esteva,UNAM Gala Reception Josefina Alvarez, University of New Mexico 8:30 PM – 10:30 PM Golden Eagle Suite, University Union 8:30AM On Matrix Transformations on some Sequence (5) Spaces. Preliminary report. Lourdes Palacios*, Universidad Autonoma Metropolitana - Universidad Nacional Autonoma de Thursday, May 20 Mexico, Hugo Arizmendi and Angel Carrillo, Instituto de Matematicas, Universidad Nacional Meeting Registration Autonoma de Mexico (944-46-31) 9:00AM Every Reasonably Sized Matrix Group is a Subgroup 8:00 AM – 4:00 AM Lyceum Lobby, University Union

I (6) of S∞. Robert R. Kallman, University of North Texas Exhibits and Book Sale (944-46-253) 9:30AM On the axiomatics of joint spectra. Preliminary 8:00 AM – 5:00 PM Silver Eagle Suites, University Union (7) report. Antoni Wawrzynczyk´ , Universidad Autonoma´ Special Session on Stochastic Systems and Control, I Metropolitana - Iztapalapa (944-46-82) AM 8:30 AM – 10:20 AM Room 409, University Union 10:00 Divergence-free multiwavelets. Preliminary report. (8) Maria C. Pereyra*, University of New Mexico, and Organizers: Daniel Hernandez-Hernandez, Joseph D. Lakey, New Mexico State University CINVESTAV (944-41-323)

The time limit for each contributed paper in the sessions is ten minutes. found in Volume 20, Issue 3 of Abstracts of papers presented to the In the Special Sessions the time limit varies from session to session and American Mathematical Society, ordered according to the numbers in within sessions. To maintain the schedule, time limits will be strictly parentheses following the listings. The middle two digits, e.g., 897-20- enforced. 1136, refer to the Mathematical Reviews subject classification assigned For papers with more than one author, an asterisk follows the name of by the individual author. Groups of papers for each subject are listed the author who plans to present the paper at the meeting. chronologically in the Abstracts. The last one to four digits, e.g., 897-20-

Papers flagged with a solid triangle ( I) have been designated by the 1136, refer to the receipt number of the abstract; abstracts are further author as being of possible interest to undergraduate students. sorted by the receipt number within each classification. Abstracts of papers presented in the sessions at this meeting will be

Appendix–22 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Thursday, May 20 – Program of the Sessions

Special Session on Continuum Theory (in honor of the Special Session on Geometric and Symbolic Dynamical 60th birthday of Professor Sam B. Nadler Jr.), I Systems, I

8:30 AM – 10:20 AM Room 117, Wooten Hall 8:30 AM – 10:20 AM Room 255, Eagle Student Services Center Organizers: Wayne Lewis, Texas Tech University Sergio Macias,UNAM Organizers: Luca Q. Zamboni, University of North Texas Alejandro Illanes,UNAM Edgardo Ugalde, University of San Luis 8:30AM The mathematical work of Professor Sam B. Nadler Potosi (9) Jr. Alejandro Illanes, Universidad Nacional Autonoma 8:30AM Generalization of the Siegel integral formula and de Mexico (944-54-325) (20) asymptotics for length spectra of quadratic differentials. 9:30AM Bumping Boundaries Outside Continua. William A. Veech, Rice University (944-99-346) (10) Eric L. McDowell*andB. E. Wilder, Berry College (944-54-348) 9:30AM Poisson Statistics of return times. Preliminary (21) report. 10:00AM Dendroids,digraphs and posets. Benoˆıt Saussol, Instituto Superior Tecnico (11) Victor Neumann-Lara, Instituto de (944-58-54) Matematicas,UNAM (944-54-320) 10:00AM Return times for minimal sets. Preliminary report. (22) Sandro Vaienti, Centre de Physique Theorique (944-28-349) Special Session on Differential Equations, Nonlinear Analysis, and Numerical Solutions to PDEs, I Special Session on Low Dimensional Topology, I

8:30 AM – 10:20 AM Room 413, University Union 8:30 AM – 10:20 AM Room 212, Wooten Hall Organizers: John W. Neuberger, University of Organizers: Mark W. Brittenham, University of North Texas North Texas Alfredo C. Nicolas,UAM Francisco Gonzalez Acuna,IM-UNAM 8:30AM A Damped Conservation Law for the Energy Luis Valdez-Sanchez, University of (12) Spectrum in Turbulence Theory. Texas at El Paso Ciprian I. Foias*, Indiana University, and John W. 8:30AM Minimal Volume Maximal Cusps in Hyperbolic Neuberger, University of North Texas (944-76-67) (23) 3-Manifolds. 9:00AM Generalized Fourier transform for Schroedinger Colin Adams*, Williams College, David Biddle, (13) operators with potentials of order zero. SUNY-Binghamton, Carol Gwosdz, University of Shmuel Agmon, The Hebrew University of Dallas, Kathy Paur,MIT,andScott Reynolds, Jerusalem, Jaime Cruz-Sampedro*, UDLA-P, and Ira Williams College (944-57-247) W. Herbst, University of Virginia (944-35-13) 9:00AM Genus two 3–manifolds are built from handle 9:30AM Morse index and Newton’s method for solutions of (24) number one pieces. (14) nonlinear elliptic PDE. Preliminary report. Eric D. Sedgwick, Oklahoma State University John M. Neuberger, NAU (944-35-14) (944-57-277) 10:00AM The Ginzburg-Landau Functional on a Rectangle 9:30AM Quasi-Fuchsian surfaces of arbitrarily high genus. (15) with Holes. Preliminary report. (25) Preliminary report. Robert J. Renka*andJohn W. Neuberger, Elizabeth Finkelstein, Hunter College (CUNY) University of North Texas (944-65-112) (944-57-363) 10:00AM The geometry of R-covered foliations. Preliminary (26) report. Danny C. Calegari, UC Berkeley (944-57-42) Special Session on Algebraic Geometry and Commutative Algebra, I Special Session on Stochastic Processes, I 8:30 AM – 10:30 AM Room 417, University Union 8:30 AM – 10:20 AM Room 118, Wooten Hall Organizers: Javier Elizondo,UNAM Organizers: Frederi G. Viens, University of North Xavier Gomez-Mont,CIMAT Texas Alberto Corso, Michigan State Jorge A. Leon, CINVESTAV University Juan Ruiz de Chavez,UAM David A. Jorgensen, University of 8:30AM Stationary and self-similar processes driven by Levy Texas at Arlington (27) processes. 8:30AM On systems of binomials in toric varieties. Victor Perez Abreu, CIMAT (944-60-286) (16) Shalom Eliahou, Universit´eduLittoral,CALAIS 9:00AM Construction of the Cauchy principal value (CPV) . C´edex, France, and Rafael H. Villarreal*, (28) Maria Emilia Caballero*, IMATE-UNAM , and Jean CINVESTAV-IPN, M´exico (944-13-140) Bertoin, Laboratoire de Probabilites (944-60-116) 9:00AM Associated Primes of Toric Initial Ideals. 9:30AM Some Laws of the Iterated Logarithm for the (17) Rekha R. Thomas*, Texas A&M University, and (29) Generalized Domain of a Gaussian law. Serkan Hosten, George Mason University Steven J. Sepanski, Saginaw Valley State University (944-13-311) (944-60-115) 9:30AM Noether normalizations of some subrings of graphs. 10:00AM The exit time of Brownian motion from the interior (18) Preliminary report. (30) of a parabola. Adri´an Alc´antar,ESFM-IPN,M´exico (944-13-180) Rodrigo Banuelos, Purdue University, R. Dante 10:00AM Integral closure, conductors and direct summands. DeBlassie*, Texas A&M University, and Robert (19) Daniel Katz, University of Kansas (944-13-302) Smits, Syracuse University (944-60-142)

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–23 Program of the Sessions – Denton, TX, Thursday, May 20 (cont’d.)

Special Session on Ring Theory, I Special Session on Smooth Dynamical Systems, I

8:30 AM – 10:20 AM Room 418, University Union 8:30 AM – 10:20 AM Room 116, Wooten Hall Organizers: Carlos Signoret-Poillon, UNAM-UAM Organizers: David A. Delatte, University of North Sergio Lopez-Permouth, Ohio Texas University Dan Mauldin, University of North Ricardo Alfaro, University of Texas Michigan-Flint Jose Seade,UNAM 8:30AM Equations in modules and chain conditions. Mariusz Urbanski, University of North (31) Preliminary report. Texas John Dauns, Tulane University (944-16-234) Alberto Verjovsky,UNAM 9:00AM Preinjective modules and finite representation type 8:30AM Talk # 20 by William Veech is held jointly with this (32) of Artinian rings. session in Room 255, ESSC. Nguyen V. Dung, Ohio University (944-16-250) 9:30AM Hyperbolicity and Astigmatism in High- dimensional 9:30AM π-regularity of band graded rings, Munn rings, and (40) Focusing Billiards. (33) inverse semigroup rings. Leonid A. Bunimovich, Georgia Tech (944-58-137) Hema Gopalakrishnan, Texas A&M University 10:00AM Chaotic billiard dynamics on surfaces of constant (944-16-225) (41) curvature. 10:00AM On FI-Extending Modules and Rings. Preliminary Eugene Gutkin, USC (944-58-269) (34) report. Gary F. Birkenmeier, University of Southwestern Special Session on Algebraic Topology, I Louisiana, Bruno J. Mueller, McMaster University, and S. Tariq Rizvi*, The Ohio State University 8:30 AM – 10:20 AM Room 215, Wooten Hall (944-16-377) Organizers: Frederick R. Cohen, University of Rochester Samuel Gitler, University of Rochester Special Session on Noncommutative Geometry, Carlos Prieto,UNAM Quantum Groups, and Applications, I 8:30AM New Techniques for Understanding the Cohomology (42) of Simple Groups. Preliminary report. 8:30 AM – 10:20 AM Room 112, Wooten Hall R. James Milgram, Stanford University (944-55-220) 9:30AM Isogenies and the K(2)-local sphere. Preliminary Organizers: Micho Durdevich,UNAM (43) report. Hanna Ewa Makaruk, Los Alamos Charles W. Rezk, Northwestern University National Laboratory (944-55-340) Robert M. Owczarek, Los Alamos 10:00AM An Application of The Thomified Eilenberg-Moore National Laboratory (44) spectral sequence. Preliminary report. 8:30AM Non-Commutative Geometry and Twists. Douglas C. Ravenel, University of Rochester (35) Arthur M. Jaffe, Harvard University (944-51-238) (944-55-284) 9:30AM Quantum Symmetry in Transverse Differential (36) Geometry. Special Session on Differential Geometry and Alain Connes and Henri Moscovici*, The Ohio Geodesics, I State University (944-53-344) 8:30 AM – 10:20 AM Room 214, Wooten Hall Organizers: Phillip E. Parker, Wichita State University Special Session on Combinatorics and Combinatorial Geometry, I Lilia Del Riego, Univ. Auto. de San Luis Potosi

8:30 AM – 10:20 AM Room 213, Wooten Hall 8:30AM Null generators of Cauchy horizons. (45) John K. Beem*, University of Missouri-Columbia, Organizers: Jorge Urrutia, IMATE-UNAM and and Andrzej Krolak´ , Polish Academy of Sciences University of Ottawa (944-53-15) Wlodzimierz Kuperberg, Auburn 9:00AM Discussion. University 9:30AM Particle Geodesics and Spectra in the Spacetime

8:30AM Equality case in sums of distinct congruence I (46) Tangent Bundle. (37) classes. Preliminary report. Howard E. Brandt, Army Research Laboratory Llano-Perez Bernardo, Universidad Nacional (944-53-33) Autonoma´ de M´exico (944-05-392) 10:00AM Causality-generated topology for future boundaries 9:10AM On the Existence of Trichromatic Triangles among (47) of spacetimes. Preliminary report. (38) 3-edge Colorings of Kn. Preliminary report. Steven G. Harris, Saint Louis University Bernardo M. Abrego, Jozsef Beck and Silvia (944-53-267) Fernandez-Merchant*, Rutgers University (944-05-299) Special Session on Representation Theory of 9:50AM Optimal Floodlight Illumination of Stages. Algebras, I

I (39) Felipe Contreras*, University of Ottawa, Jurek Czyzowicz, Universit´eduQu´ebec `a Hull, 9:00 AM – 10:20 AM Room 411, University Union Eduardo Rivera-Campo, Universidad Autonoma´ Metropolitana, and Jorge Urrutia, University of Organizers: Jose A. de la Pena,UNAM Ottawa (944-05-386) Christof Geiss,UNAM

Appendix–24 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Thursday, May 20 – Program of the Sessions

Birge Huisgen-Zimmerman, University 3:30PM Some connectedness properties of Julia sets. of California at Santa Barbara (60) Irving N. Baker, Imperial College UK, and Patricia 9:00AM The algebras with discrete derived categories. Dominguez*, Universidad Autonoma de Puebla, (48) Preliminary report. Mx. (944-30-95) Dieter Vossieck, Instituto de Matematicas, UNAM 4:00PM Distribution of return times for rational maps. (944-16-319) (61) Nicolai T. A. Haydn, University of Southern 10:00AM Derived-tame algebras. Preliminary report. California (944-58-289) (49) Jose A. de la Pena, UNAM (944-16-350)

Invited Address Special Session on Stochastic Systems and Control, II 11:00 AM – NOON Lyceum, University Union (50) Parametrization of Modules. 2:00 PM – 4:20 PM Room 409, University Union Raymundo Bautista, Instituto de Matem´aticas, Organizers: Daniel Hernandez-Hernandez, UNAM (944-16-318) CINVESTAV Onesimo Hernandez-Lerma, Special Session on Noncommutative Geometry, CINVESTAV Quantum Groups, and Applications, II Guillermo Ferreyra, Louisiana State 1:00 PM – 4:30 PM Room 112, Wooten Hall University 2:00PM Reflected Diffusions in Polyhedral Domains and a Organizers: Micho Durdevich,UNAM (62) Model of Generalized Processor Sharing. Preliminary Hanna Ewa Makaruk, Los Alamos report. National Laboratory Kavita Ramanan*andMartin Reiman, Bell Robert M. Owczarek, Los Alamos Laboratories, Lucent Technologies (944-60-322) National Laboratory 2:30PM Sample-Path Average Cost Optimality for | 1:00PM Classification of Integration Patterns on R1 1. (63) Semi-Markov Control Processes on Borel Sapaces: (51) Oscar A. Sanchez-Valenzuela*, CIMAT, and Carles Unbounded Costs and Mean Holding Times. Victoria-Monge, UPC-Barcelona (944-58-149) Oscar Vega-Amaya*andFernando Luque-V´asquez, Universidad de Sonora 2:00PM Lattice gauge field theory and skein modules. (52) Douglas Bullock, Boise State University, Charles (944-93-170) Frohman, University of Iowa, and Joanna 3:00PM Discrete-time stochastic control problems in the

Kania-Bartoszynska*, Boise State University I (64) gambling industry. Preliminary report. (944-81-262) W. George Cochran, Louisiana State Univ. 2:50PM Homotopy quantization of skein modules. (944-93-359) (53) Jozef H. Przytycki, GWU (944-57-309) 3:30PM New Estimates of Stability in some Queues and 3:40PM Exotic traces. (65) Insurance Risk Models. (54) Mariusz Wodzicki, University of California at Evgueni Gordienko, UAM-I (944-93-308) Berkeley (944-47-342) 4:00PM Adaptive Policies for Discrete-Time Markov Control (66) Procesess with Unbounded Costs under Average Special Session on Smooth Dynamical Systems, II Criterion. Adolfo Minj´arez-Sosa, Universidad de Sonora 1:00 PM – 4:20 PM Room 116, Wooten Hall (944-93-169) Organizers: David A. Delatte, University of North Texas Dan Mauldin, University of North Texas Special Session on Functional Analysis and Its Applications, II Jose Seade,UNAM

Mariusz Urbanski, University of North 2:00 PM – 3:50 PM Room 210, Wooten Hall Texas Alberto Verjovsky,UNAM Organizers: S. Perez-Esteva,UNAM 1:00PM Natural measures on the unstable and invariant Josefina Alvarez, University of New (55) manifolds in open billiards. Preliminary report. Mexico Peter A. Richardson, University of North Texas 2:00PM Variational Datta Fitting. (944-58-407) (67) Jose L. Martinez Morales, Instituto de 1:30PM Complex Schottky groups and Limit Sets. Matem´aticas, UNAM (944-65-08)

I (56) Preliminary report. 2:30PM Existence of extremals for some discontinuous Guillermo Sienra, UNAM (944-58-288) (68) functionals of geometric function theory. 2:00PM Some holomorphic dynamical systems determined Preliminary report. (57) by covering spaces. Preliminary report. Michael D. O’Neill*andRobert E. Thurman, UTEP Kevin M. Pilgrim, Univ. of Missouri, Rolla (944-30-312) (944-58-20) 3:00PM Compactness in Lp-subspaces of Holomorphic 2:30PM Schottky groups on higher dimensional complex (69) Functions. (58) projective spaces. Jos´e A. Canavati and Fernando Galaz-Fontes*, Jose A. Seade*andAlberto S. Verjovsky, Instituto Centro de Investigacion´ en Matem´aticas de Matematicas, UNAM (944-32-102) (944-46-161) 3:00PM Higher dimensional complex Kleinian groups via 3:30PM Some Characterizations of Q-algebras. (59) twistor theory. (70) Hugo Arizmendi*, Instituto de Matematicas, Alberto S. Verjovsky*andJose A. Seade, Instituto Universidad Nacional Autonoma de Mexico, and de Matematicas, UNAM (944-32-103) Vesko Valov, University of Swaziland (944-46-45)

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–25 Program of the Sessions – Denton, TX, Thursday, May 20 (cont’d.)

Special Session on Continuum Theory (in honor of the 2:30PM Depth for complexes, and intersection theorems. 60th birthday of Professor Sam B. Nadler Jr.), II (82) Srikanth B. Iyengar, University of Missouri (944-13-159) 2:00 PM – 4:20 PM Room 117, Wooten Hall 3:00PM Refinements of a Conjecture of Nagata. Preliminary (83) report. Organizers: Wayne Lewis, Texas Tech University Brian Harbourne, University of Nebraska-Lincoln Sergio Macias,UNAM (944-14-292) Alejandro Illanes,UNAM 3:40PM On the torsion freeness of symmetric powers of 2:00PM The Life and Times of Sam B. Nadler Jr. (84) ideals.

I (71) Thelma R. West, University of Southwestern Alexandre Tchernev, University of Missouri - Louisiana (944-01-193) Columbia (944-13-330) 2:30PM Problems on hyperspace retractions. 4:10PM Fat point ideals for 8 or fewer points of P2. (72) Janusz J. Charatonik*andWłodzimierz J. (85) Preliminary report. Charatonik, Universidad Nacional Autonoma de Brian Harbourne, University of Nebraska, Sandeep Mexico (944-54-177) Holay, Southeast Community College, and 3:00PM Inverse Limits on [0, 1] Using Piecewise Linear Stephanie Fitchett*, Duke University (944-14-313) (73) Unimodal Bonding Maps, II. Preliminary report. W. T. Ingram, University of Missouri - Rolla Special Session on Geometric and Symbolic Dynamical (944-54-174) Systems, II 3:30PM A degree of non-local connectedness. (74) Janusz J. Charatonik and Włodzimierz J. 2:00 PM – 4:20 PM Room 115, Wooten Hall Charatonik*, Universidad Nacional Autonoma de Mexico (944-54-176) Organizers: Luca Q. Zamboni, University of North Texas 4:00PM Expansive Homeomorphisms and Invariant Cantor (75) Sets. Preliminary report. Edgardo Ugalde, University of San Luis Christopher G. Mouron, University of Delaware Potosi (944-54-283) 2:00PM On Two-Sided Infinite Fixed Points of Morphisms and (86) the Equation h(xy) = yx in finite words. Special Session on Differential Equations, Nonlinear Jeffrey Shallit and Ming-wei Wang*, University of Waterloo (944-68-97) Analysis, and Numerical Solutions to PDEs, II 2:30PM About sturmian words and morphisms. 2:00 PM – 4:20 PM Room 413, University Union (87) Adel Guerziz, University of Picardie (944-05-397) 3:00PM Algebraic presentation of good finitary Organizers: John W. Neuberger, University of (88) isomorphisms of Markov shifts. Preliminary report. North Texas Ricardo Gomez, University of Maryland Alfredo C. Nicolas,UAM (944-58-358) 2:00PM An inverse function theorem and applications. 3:30PM Automorphisms of Graphs and Surfaces. (76) Preliminary report. (89) Jerome E. Los, INLN (Nice, France), and Zbigniew Alfonso Castro, University of Texas at San Antonio. H. Nitecki*, Tufts University (944-58-40) (944-35-34) 4:00PM Factors of Markov Subshifts. 2:30PM Hidden Ground States. (90) Anthony N. Quas*andPaul B. Trow, University of (77) Henry A. Warchall*, University of North Texas, and Memphis (944-58-424) Fred B. Weissler, Universite Paris XIII (944-35-65) 3:00PM Remarks on Blow-up in Nonlinear Wave and Special Session on Low Dimensional Topology, II (78) Kirchhoff Equations. Preliminary report. Jorge A. Esquivel-Avila, Universidad Autonoma 2:00 PM – 4:20 PM Room 212, Wooten Hall Metropolitana (944-35-30) 3:30PM On the construction of the couple coefficients for Organizers: Mark W. Brittenham, University of North Texas I (79) the two block AKNS system. Gulmaro Corona Corona, UAMA, Depto de Ciencias Francisco Gonzalez Acuna,IM-UNAM Basicas (944-35-07) Luis Valdez-Sanchez, University of 4:00PM Aubry-Mather theory for PDE and pseudodifferential Texas at El Paso (80) operators. 2:00PM Comparing Heegaard and JSJ structures of Rafael de la Llave, Univ. of Texas at Austin (91) orientable 3-manifolds. (944-35-129) Martin G. Scharlemann*, University of California, Santa Barbara, and Jennifer Schultens, Emory Special Session on Algebraic Geometry and University (944-57-205) Commutative Algebra, II 2:30PM Length multiplicities of hyperbolic 3-manifolds. (92) Joseph D. Masters, University of Texas– Austin 2:00 PM – 4:30 PM Room 417, University Union (944-57-139) 3:00PM Abelian subgroup separability of Haken Organizers: Javier Elizondo,UNAM (93) 3-manifolds. Preliminary report. Xavier Gomez-Mont,CIMAT Emily Hamilton, Emory University (944-57-287) Alberto Corso, Michigan State 3:30PM Normal forms of generating pairs for Fuchsian and University (94) related groups. David A. Jorgensen, University of Arturo F. Ram´irez*, CIMAT, and Francisco Texas at Arlington Gonz´alez-Acuna˜ , IMATE, UNAM (944-20-194) 2:00PM On low rank algebraic vector bundles. 4:00PM Seifert fibered surgeries on hyperbolic knots. (81) N. Mohan Kumar, Chris Peterson*, Washington (95) Preliminary report. University, and A. Prabhakar Rao, University of Cameron McA. Gordon*andJohn Luecke, Missouri - St. Louis (944-14-341) University of Texas at Austin (944-57-406)

Appendix–26 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Thursday, May 20 – Program of the Sessions

Special Session on Stochastic Processes, II 2:40PM Algorithms to Tile the Infinite Grid with Finite (106) Clusters. 2:00 PM – 4:20 PM Room 118, Wooten Hall Mario Szegedy, AT&T Research (944-51-260) Organizers: Frederi G. Viens, University of North 3:20PM Packing 12, 13 and 19 equal circles in a circle. Texas I (107) Ferenc Fodor, Auburn University (944-52-182) Jorge A. Leon, CINVESTAV Special Session on Algebraic Topology, II Juan Ruiz de Chavez,UAM 2:00PM Monte Carlo Methods for Stochastic Differential 2:00 PM – 4:20 PM Room 215, Wooten Hall (96) Equations. Preliminary report. Organizers: Frederick R. Cohen, University of Philip Protter, Purdue University (944-60-155) Rochester 2:30PM Self-Normalized Martingales: Exponential Samuel Gitler, University of Rochester (97) Inequalities and Moments. Preliminary report. Victor H. de la Pena˜ *, Columbia University, Michael Carlos Prieto,UNAM J. Klass, UC Berkeley, and TzeL.Lai,Stanford 2:00PM K theoretic Adams spectral sequence and the University (944-60-166) (108) exponent of the stable homotopy groups of spheres. 3:00PM On Convergence Theorems for Quantiles. Jesus Gonzalez, CINVESTAV - IPN (944-55-80) (98) Jose M. Gonzalez-Barrios*andRaul Rueda, IIMAS, 2:30PM Homotopy exponents of mod-2r Moore spaces. UNAM (944-60-27) (109) Stephen D. Theriault, University of Illinois at 4:00PM Conditional laws and dominating points. Chicago (944-55-343) (99) Ana Meda, Facultad de Ciencias, UNAM 3:00PM From Representation Theory to Homotopy Groups. (944-60-120) (110) Donald M. Davis, Lehigh University (944-55-12) 3:30PM On Natural Coalgebra Decompositions of Tensor (111) Algebras and Natural Decompositions of Loop Special Session on Ring Theory, II Suspensions. Jie Wu*, University of Pennsylvania, and Paul 2:00 PM – 4:20 PM Room 418, University Union Selick, University of Toronto (944-55-26) Organizers: Carlos Signoret-Poillon, UNAM-UAM 4:00PM R-Quillen theorems. Sergio Lopez-Permouth, Ohio (112) Calin Popsecu, Universite´ Catholique de Louvain University (944-55-89) Ricardo Alfaro, University of Michigan-Flint Special Session on Complex Analysis, I

2:00PM On the lattices of natural and conatural classes in 2:00 PM – 4:20 PM Room 111, Wooten Hall (100) R-mod. Preliminary report. Alejandro Alvarado*, Hugo Alberto Rincon-Mejia Organizers: E. Ramirez de Arellano, CINVESTAV and Jose Rios, Universidad Nacional Autonoma de John E. Fornaess, University of Mexico (944-16-96) Michigan, Ann Arbor 2:30PM On Linear Filters and Torsion Theories in σ [M]. 2:00PM On equivalence of certain sufficient conditions for (101) Preliminary report. (113) global regularity of the d-bar Neumann problem. Saul Diaz-Alvarado*, Universidad Autonoma del Preliminary report. Estado de Mexico, and Jose Rios, Instituto de Emil J. Straube, Texas A&M University (944-32-356) Matematicas, UNAM (944-16-184) 2:30PM Equivalence of Condition R and Existence of Global 3:00PM The lattice of pre-natural classes of modules. (114) Smooth Linear/Solution Operators of the (102) Yiqiang Zhou, Memorial University of ∂d-Equation on Smoothly Bounded Pseudoconvex Newfoundland (944-16-186) Domains in Cn. 3:30PM The lattice structure of preradicals. Preliminary Norberto Salinas, University of Kansas (103) report. (944-47-185) Francisco Raggi*, Instituto de Matematicas, UNAM, 3:00PM Hypoellipticity on CR manifolds. Hugo Rincon, Facultad de Ciencias, UNAM, Jose (115) Joseph J. Kohn, Princeton University (944-32-420) Rios, Instituto de Matematicas, UNAM, and 3:30PM Polynomial hulls and an optimization problem. Carlos Signoret, Depto. de Matematicas, UAM-I (116) Preliminary report. (944-16-315) Marshall A. Whittlesey, Texas A&M University 4:00PM On the nilpotence of the τ-closed prime radical in (944-32-374) (104) rings with τ-Krull dimension. Preliminary report. 4:00PM Bergman Space on Tube Domains and Commuting Toma Albu, University of Bucharest, Gunter¨ R. (117) Toeplitz Operators. Krause*, University of Manitoba, and Mark L. Teply, Nikolai Vasilevski and Enrique Ramirez de University of Wisconsin-Milwaukee (944-16-229) Arellano*, CINVESTAV-IPN (944-32-191)

Special Session on Combinatorics and Combinatorial Special Session on Differential Geometry and Geometry, II Geodesics, II

2:00 PM – 3:50 PM Room 213, Wooten Hall 2:00 PM – 4:20 PM Room 214, Wooten Hall Organizers: Jorge Urrutia, IMATE-UNAM and Organizers: Phillip E. Parker, Wichita State University of Ottawa University Wlodzimierz Kuperberg, Auburn Lilia Del Riego, Univ. Auto. de San Luis University Potosi 2:00PM Rigity of Hamming spaces and Mastermind game. 2:00PM Volume Comparison on Pseudo-Riemannian (118) Manifolds. I (105) Preliminary report. Grigori A. Kabatianski, Texas A&M University Paul E. Ehrlich, University of Florida (944-53-24) (944-05-391) 2:30PM Discussion.

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–27 Program of the Sessions – Denton, TX, Thursday, May 20 (cont’d.)

3:00PM A Note on the pseudo-Riemnnian Osserman Dan Mauldin, University of North (119) problem. Texas Maria E. Vazquez-Abal*, Eduardo Garcia-Rio, Univ. Jose Seade,UNAM Santiago de Compostela (Spain), Demir N. Kupeli, Mariusz Urbanski, University of North Middle East Technical University (Turkey), and Texas Ramon Vazquez-Lorenzo, Univ. Santiago de Compostela (Spain) (944-53-92) Alberto Verjovsky,UNAM 3:30PM Geodesic completeness for semiRiemannian 8:00AM Hyperbolicity and KAM Bottles in Driven Lorentz (120) transverse structures on foliations. Preliminary (128) Gas. Preliminary report. report. Maciej P. Wojtkowski, University of Arizona Alberto Candel, California Institute of Technology, (944-58-389) and Raul Quiroga*, CINVESTAV-IPN (944-53-163) 8:30AM Invariant manifolds associated to non-resonant 4:00PM Functional Geodesics and Gravitational Fields. (129) subspaces. (121) Preliminary report. Rafael de la Llave, Univ. of Texas at Austin Hernando Quevedo, Instituto de Ciencias (944-58-131) Nucleares UNAM (944-83-413) 9:00AM Lagrangian flows: The dynamics of globally (130) minimizing orbits. Special Session on Representation Theory of Gonzalo Contreras,CIMAT,Jorge Delgado, Algebras, II UFF-Brazil, and Renato Iturriaga*, CIMAT (944-58-101) 2:30 PM – 4:20 PM Room 411, University Union 9:30AM Lagrangian Graphs and Man˜´e’s Critical Values. (131) Gonzalo Contreras*, Renato Iturriaga,CIMAT, Organizers: Jose A. de la Pena,UNAM Gabriel Paternain and Miguel Paternain, Christof Geiss,UNAM CMAT-Uruguay (944-58-272) Birge Huisgen-Zimmerman, University 10:00AM Finsler Metrics and Action Potentials. Preliminary of California at Santa Barbara (132) report. 2:00PM Global dimension and characteristic independence. Renato Iturriaga, CCIMAT, and Hector (122) Edward L. Green, Virginia Tech University, Oyvind Sanchez-Morgado*, Instituto de Matematicas. Solberg, University of Trondheim, Norway, and Dan UNAM (944-58-93) Zacharia*, Syracuse University (944-16-212) 2:30PM Brauer tree algebras and universal deformation Special Session on Stochastic Systems and Control, III (123) rings. Preliminary report. Frauke M. Bleher*, Southern Illinois University, and 8:30 AM – 10:20 AM Room 409, University Union Ted Chinburg, University of Pennsylvania (944-16-236) Organizers: Daniel Hernandez-Hernandez, 3:00PM Grobner¨ Bases associated to bases of finite modules. CINVESTAV (124) Preliminary report. Onesimo Hernandez-Lerma, Maria A. Avin˜o´*andLuis D. Garcia, Universidad CINVESTAV Nacional Autonoma de Mexico (944-16-239) Guillermo Ferreyra, Louisiana State 3:30PM The Uniserial Geometry of Multiserial Algebras. University (125) Brian J. Jue, U.C. Santa Barbara (944-16-355) 8:30AM Recent Advances in Identification and Adaptive 4:00PM The Upper Annihilating Series of a Finite (133) Control of Some Stochastic Systems.

I (126) Endomorphism Ring. Bozenna Pasik-Duncan, University of Kansas Mar´ia Alicia Avin˜o´ and Marcos Zyman*, Facultad (944-93-276) de Ciencias, UNAM (944-16-393) 9:30AM One HJB equation with nonlinear boundary (134) conditions. Preliminary report. Invited Address Angel Soriano, IMATE-UNAM (944-49-63) 10:00AM On the Value Function for Some Stochastic Control 5:00 PM – 6:00 PM Lyceum, University Union (135) Problem. Jesus A. Pascal, Universidad del Zulia, Venezuela

I (127) Gradient systems in finite and infinite dimensions. Jack K. Hale, Georgia Institute of Technology (944-93-219) (944-34-423) Special Session on Functional Analysis and Its Applications, III Friday, May 21 8:30 AM – 10:20 AM Room 210, Wooten Hall Organizers: S. Perez-Esteva,UNAM Exhibits and Book Sale Josefina Alvarez, University of New Mexico 8:00 AM – 5:00 PM Silver Eagle Suites, University Union 8:30AM Some aspects of normal structure in Banach spaces. (136) Helga Fetter*andBerta Gamboa de Buen, Centro Meeting Registration de Investigacion´ en Matem´aticas (944-46-76)

8:00 AM – 4:00 PM Lyceum Lobby, University Union 9:00AM Completeness and regulariry of inductive limits. (137) Preliminary report. Carlos Bosch*, Instituto Tecnologico Autonomo de Special Session on Smooth Dynamical Systems, III Mexico and Washington State University, and Jan Kucera, Washington State University (944-46-111) 8:00 AM – 10:20 AM Room 116, Wooten Hall 9:30AM Normed Barrelled Spaces. Preliminary report. Organizers: David A. Delatte, University of North (138) Christopher E. Stuart, Eastern New Mexico Texas University (944-46-64)

Appendix–28 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Friday, May 21 – Program of the Sessions

10:00AM Polynomial convergence of sequences in Banach 9:00AM Depth of symmetric algebras of certain ideals. (139) spaces. (149) Mark R. Johnson, University of Arkansas Fernando Bombal, Universidad Complutense de (944-13-304) Madrid, and Maite Fernandez-Unzueta*, Centro de 9:30AM On residually S2 ideals. Preliminary report. Investigacion en Matematicas (944-46-85) (150) Claudia Polini*, Hope College, and Alberto Corso, Michigan State University (944-13-151) Special Session on Continuum Theory (in honor of the 10:00AM Strange summands of direct sums of copies of a 60th birthday of Professor Sam B. Nadler Jr.), III (151) module. Preliminary report. Roger A. Wiegand, University of Nebraska 8:30 AM – 10:20 AM Room 117, Wooten Hall (944-13-314) Organizers: Wayne Lewis, Texas Tech University Sergio Macias,UNAM Special Session on Geometric and Symbolic Dynamical Alejandro Illanes,UNAM Systems, III 8:30AM Local Conectedness and Unicoherence at 8:30 AM – 10:20 AM Room 115, Wooten Hall (140) Subcontinua. Preliminary report. Deborah Oliveros*, Instituto de Matem´aticas, and Organizers: Luca Q. Zamboni, University of North Isabel Puga, Facultad de Ciencias U.N.A.M. Texas (944-54-200) Edgardo Ugalde, University of San Luis 9:00AM Boundaries of preimages of Siegel disks of Potosi (141) polynomials. Preliminary report. 8:30AM Higher dimensional “solenoids” as bundles. James T. Rogers Jr., Tulane University (944-58-135) (152) Preliminary report. 9:30AM On semi-universal mappings. Robert F. Williams, The University of Texas at (142) Escobedo Raul´ , Instituto de Matematicas, UNAM Austin (944-58-301) (944-54-204) 9:00AM Systems of rotations with two atoms. Preliminary

10:00AM On the Nonexistence of Almost Continuous I (153) report. (143) Surjections between Certain Continua. Arek Goetz, Boston University (944-58-148) SamB.NadlerJr., West Virginia University 9:30AM Geometry and coding for billiards on surfaces of (944-54-162)

I (154) constant curvature. Preliminary report. Eugene Gutkin, USC (944-51-271) Special Session on Differential Equations, Nonlinear 10:00AM An entropy estimate for infinite interval exchange Analysis, and Numerical Solutions to PDEs, III (155) transformations. Preliminary report. Frank Blume, John Brown University (944-28-17) 8:30 AM – 10:20 AM Room 413, University Union Organizers: John W. Neuberger, University of Special Session on Low Dimensional Topology, III North Texas Alfredo C. Nicolas,UAM 8:30 AM – 10:20 AM Room 212, Wooten Hall 8:30AM Radial solutions to a Dirichlet problem arising in Organizers: Mark W. Brittenham, University of (144) Astrophysics. Preliminary report. North Texas Alfonso Castro, The University of Texas at San Francisco Gonzalez Acuna,IM-UNAM Antonio, and Victor Padron*, The University of Texas at San Antonio and Universidad de Los Luis Valdez-Sanchez, University of Andes, Merida, Venezuela (944-35-59) Texas at El Paso 9:00AM Boundary Value Problems for Fourth Order 8:30AM Positive diagrams for Seifert manifolds. Preliminary (145) Composite Partial Differential. Preliminary report. (156) report. Francisco Castillo-Aranguren, Instituto John Hempel, Rice University (944-57-373) Tecnologico y de Estudios Superiores de Monterrey, 9:00AM Bounded Degeneration of Tunnel Number. Campus (944-35-29) (157) Martin G. Scharlemann,UCSB,andJennifer C. 9:30AM Diffusion in Deformable Media. Preliminary report. Schultens*, Emory University (944-57-293) (146) R. E. Showalter, University of Texas (944-35-16) 9:30AM Incompressible surfaces and 1-bridge knots w.r.t. a 10:00AM Macro-hybrid mixed finite element schemes and (158) torus. Preliminary report. (147) penalty-duality algorithms. Preliminary report. Mario Eudave-Munoz,UCSBandUNAM Gonzalo Alduncin, Mexican Institute of Petroleum (944-57-387) and Institute of Geophysics, UNAM (944-35-208) 10:00AM Minimum energy polygonal knots. Preliminary

I (159) report. Jonathan K. Simon*andJoshua Tokle,Univ.of Special Session on Algebraic Geometry and Iowa (944-57-365) Commutative Algebra, III

8:30 AM – 10:30 AM Room 417, University Union Special Session on Stochastic Processes, III Organizers: Javier Elizondo,UNAM 8:30 AM – 10:20 AM Room 118, Wooten Hall Xavier Gomez-Mont,CIMAT Alberto Corso, Michigan State Organizers: Frederi G. Viens, University of North University Texas David A. Jorgensen, University of Jorge A. Leon, CINVESTAV Texas at Arlington Juan Ruiz de Chavez,UAM 8:30AM Gorenstein Modules. Preliminary report. 8:30AM On Solutions of Stochastic Wave Equations. (148) Graham J. Leuschke, University of Nebraska (160) Preliminary report. (944-13-368) Pao-Liu Chow, Wayne State University (944-60-108)

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–29 Program of the Sessions – Denton, TX, Friday, May 21 (cont’d.)

9:30AM Stochastic Viscosity Solutions for Nonlinear 8:30AM Symbolic Dynamics from Transverse Heteroclinic (161) Stochastic Partial Differential Equations. (170) Intersections for Whiskered Tori. Rainer Buckdahn, University of Brest, and Jin Ma*, Clark Robinson, Northwestern University Purdue University (944-60-188) (944-70-403) 10:00AM Ergodic Control for the Stochastic Navier-Stokes 9:30AM Microswimming and the N body problem. (162) Equation. Preliminary report. (171) Joaquin Delgado, UAM-Iztapalapa (944-70-405) P. Sundar*, Louisiana State University, and S. S. 10:00AM Reducibility of linear cuasiperiodic systems. Sritharan, U.S. Navy (944-60-210) (172) Ruben Flores-Espinoza, Universidad de Sonora (944-70-398) Special Session on Ring Theory, III

8:30 AM – 10:20 AM Room 418, University Union Special Session on Combinatorics and Combinatorial Geometry, III Organizers: Carlos Signoret-Poillon, UNAM-UAM Sergio Lopez-Permouth, Ohio 8:30 AM – 10:20 AM Room 213, Wooten Hall University Organizers: Jorge Urrutia, IMATE-UNAM and Ricardo Alfaro, University of University of Ottawa Michigan-Flint Wlodzimierz Kuperberg, Auburn 8:30AM The Double Infinite Chain Condition for Posets With University (163) Applications to Rings and Modules. Preliminary 8:30AM Minimum kissing numbers of finite translative report.

I (173) packings of a convex body. Toma Albu, Ohio State University, Gunter Krause, Istv´an Talata, Auburn University (944-52-256) University of Manitoba, and Mark L. Teply*, University of Wisconsin-Milwaukee (944-16-295) 9:10AM Density bounds for packings with translates of a

I (174) cone (pyramid) whose base is a centrally symmetric 9:00AM Chain conditions on quotient finite (uniform) convex plane region. (164) dimensional modules. Preliminary report. Andras Bezdek, Auburn University and the Toma Albu*andS. Tariq Rizvi, The Ohio State Mathematical Institute of the Hungarian Academy of University (944-16-243) Sciences, and Wlodzimierz Kuperberg*, Auburn 9:30AM Quotient rings of algebras of functions and University (944-52-410) (165) operators. 9:50AM Acyclic Combinatorics in Tournaments. Preliminary S. K. Jain*, Ohio University, and Ajit I. Singh, (175) report. University of Delhi (944-16-316) Victor Neumann-Lara, Instituto de Matematicas, 10:00AM Iterated skew polynomial rings of quantum UNAM (944-05-321) (166) coordinate type. Preliminary report. Kenneth R. Goodearl, University of California (944-16-179) Special Session on Algebraic Topology, III

Special Session on Noncommutative Geometry, 8:30 AM – 10:20 AM Room 215, Wooten Hall Quantum Groups, and Applications, III Organizers: Frederick R. Cohen, University of Rochester 8:30 AM – 10:40 AM Room 112, Wooten Hall Samuel Gitler, University of Rochester Organizers: Micho Durdevich,UNAM Carlos Prieto,UNAM 0 Hanna Ewa Makaruk, Los Alamos 8:30AM An EO2 approach to claculating π∗(LK(2)S . National Laboratory (176) Preliminary report. Robert M. Owczarek, Los Alamos Mark E. Mahowald*andCharles Rezk, National Laboratory Northwestern University (944-55-237) 8:30AM Quantum Classifying Spaces. 9:30AM Equivariant Approximation. (167) Micho Durdevich, Institute of Mathematics, UNAM (177) Gregory Arone, University of Chicago, and William (944-58-296) G. Dwyer*, University of Notre Dame (944-55-291) 9:10AM Clifford bigebra as a quantum braided group. 10:00AM Some interesting examples of homology

I (168) Preliminary report. (178) approximations of spaces with a group action. Zbigniew Oziewicz, Universidad Nacional Gregory Z. Arone, University of Chicago Autonoma´ de M´exico, Facultad de Estudios (944-55-175) Superiores Cuautitl´an Izcalli, Estado de M´exico (944-16-11) Special Session on Differential Geometry and 10:00AM On the Topology of the Symmetry Group of the Geodesics, III (169) Standard Model. Miguel Socolovsky*, Institute of Nuclear Sciences, 8:30 AM – 10:20 AM Room 214, Wooten Hall UNAM, and Marcelo Aguilar, Institute of Mathematics, UNAM (944-20-331) Organizers: Phillip E. Parker, Wichita State University Special Session on Nonlinear Models in Biology and Lilia Del Riego, Univ. Auto. de San Luis Celestial Mechanics, I Potosi 8:30AM Geometry of Hyperbolic Operators. Preliminary 8:30 AM – 10:20 AM Room 412, University Union (179) report. Adam D. Helfer, University of Missouri-Columbia Organizers: Ernesto Perez-Chavela,UAM (944-53-415) Jorge X. Velasco-Hernandez,UAM 9:00AM Curvature of the Levi-Civita connection on the Mary E. Parrott, University of South (180) canonical bundle of a hermitian manifold. Florida Gil Bor and Luis Hernandez-Lamoneda*, CIMAT Ernesto A. Lacomba,UAM (944-53-28)

Appendix–30 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Friday, May 21 – Program of the Sessions

9:30AM Aspects of Kaehler Cone Metrics. Preliminary report. 3:00PM The strong simple connectedness of a tame tilted (181) Thalia D. Jeffres*, Instituto de Fisica y (192) algebra. Matematicas, UMSNH, and Rafe Mazzeo,Stanford Ibrahim Assem, University of Sherbrooke University (944-53-213) (944-16-419) 10:00AM The moduli space of metrics of positive scalar 3:30PM One Point Extensions of Quasitilted Algebras. (182) curvature of some even dimensional manifolds. (193) Preliminary report. Egidio Barrera-Yanez, CINVESTAV (944-53-19) Jose A. de la Pena˜ and Sonia E. Trepode*, Instituto de Matematicas, UNAM (944-16-383) Special Session on Representation Theory of 4:00PM Discussion. Algebras, III Special Session on Stochastic Systems and Control, IV 9:00 AM – 10:20 AM Room 411, University Union 2:30 PM – 4:20 PM Room 409, University Union Organizers: Jose A. de la Pena,UNAM Christof Geiss,UNAM Organizers: Daniel Hernandez-Hernandez, Birge Huisgen-Zimmerman, University CINVESTAV of California at Santa Barbara Onesimo Hernandez-Lerma, 9:00AM Infinite dimensional representations of finite CINVESTAV (183) groups. Guillermo Ferreyra, Louisiana State David J. Benson, University of Georgia (944-20-254) University 10:00AM Stable equivalence and generic modules. 2:30PM Fractional Brownian Motion and Some Applications. (184) Henning Krause, University of California, Santa (194) Tyrone E. Duncan, University of Kansas Barbara (944-16-231) (944-60-226) 3:00PM Applications to portfolio management of risk Session for Contributed Papers (195) sensitive control. Preliminary report. Daniel Hernandez, CINVESTAV (944-93-156) 9:00 AM – 10:10 AM Room 211, Wooten Hall 3:30PM Degenerate Variance Control of a Scalar Itoˆ Process. 9:15AM Numerical Study of Equations with Negative (196) Daniel Ocone*, Rutgers University, and Ananda (185) Viscosity. Weerasinghe, Iowa State University (944-93-270) Mahmoud Affouf, Penn State Univ (944-35-327) 4:00PM Controlled Markov Chains with Risk–Sensitive 9:30AM New trigonometric series expansions of the (197) Criteria: Average Cost, Optimality Equations, and (186) logarithmic derivatives of the elliptic θ1−4 functions Optimal Solutions. and of twelve Jacobian elliptic functions. Rolando Cavazos-Cadena*, Universidad Autonoma´ David S. Tselnik (944-33-114) Agraria Antonio Narro, and Emmanuel Fern´andez-Gaucherand, SIE, University of Arizona 9:45AM Ordered binary matrices and their applications. (944-93-230)

I (187) Preliminary report. G. Sampath, University of Massachusetts at Dartmouth (944-68-78) Special Session on Functional Analysis and Its 10:00AM A contractible, nowhere locally connected Applications, IV

I (188) compactum. Robert D. Edwards, UCLA (944-54-332) 2:30 PM – 3:50 PM Room 210, Wooten Hall Organizers: S. Perez-Esteva,UNAM Invited Address Josefina Alvarez, University of New Mexico 11:00 AM – NOON Lyceum, University Union 2:30PM Representing Measures and (sb) operators.

I (189) Eigenvalues, invariant factors, highest weights, and (198) Preliminary report. Schubert calculus. Elizabeth M. Bator*, University of North Texas, William Fulton, University of Michigan (944-15-305) and Dawn R. Slavens, Mount Union College (944-46-354) Invited Address 3:00PM Generalizations of Lyapounov’s convexity theorem (199) to measures with atoms. 1:00 PM – 2:00 PM Lyceum, University Union Pieter Cornelis Allaart, University of North Texas (944-28-90)

I (190) Stochastic optimal control: The direct method and the linear programming approach. Preliminary 3:30PM Locally complete and locally Baire spaces. report. (200) Preliminary report. Onesimo Hernandez-Lerma, CINVESTAV-IPN Armando Garcia, Instituto de Matematicas, (944-93-138) Universidad Nacional Autonoma de Mexico (944-46-46) Special Session on Representation Theory of Algebras, IV Special Session on Continuum Theory (in honor of the 60th birthday of Professor Sam B. Nadler Jr.), IV 2:30 PM – 4:20 PM Room 411, University Union 2:30 PM – 4:20 PM Room 117, Wooten Hall Organizers: Jose A. de la Pena,UNAM Christof Geiss,UNAM Organizers: Wayne Lewis, Texas Tech University Birge Huisgen-Zimmerman, University Sergio Macias,UNAM of California at Santa Barbara Alejandro Illanes,UNAM 2:30PM On the first Hochschild cohomology group of an 2:30PM On Period Three and Topological Entropy in

(191) algebra. I (201) Hereditarily Decomposable Arclike Continua. Manuel Saorin, University of California at Santa H´ector M´endez-Lango, Universidad Nacional Barbara (944-16-187) Autonoma de Mexico (944-54-57)

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–31 Program of the Sessions – Denton, TX, Friday, May 21 (cont’d.)

3:00PM Boundaries of Rotation Domains. Preliminary report. 2:30PM Multifractal Analysis of Gibbs measures and Option (202) Andrew O. Maner, John C. Mayer*andLex G. (213) Pricing. Preliminary report. Oversteegen, UAB (944-54-241) Roza Galeeva, Universidad Nacional Autonoma de 3:30PM Smooth Fans and Unique Hyperspace. Mexico (944-58-55)

I (203) Gerardo Acosta, Universidad Nacional Autonoma 3:00PM Symbolic dynamics for sticky sets in Hamiltonian de Mexico (944-54-51) (214) systems. 4:00PM Nonseparating Plane Continua. Jesus´ Ur´ıas*andValentin Afraimovich, Universidad Autonoma de San Luis Potosi I (204) Charles L. Hagopian, California State University, Sacramento (944-54-141) (944-58-53) 3:30PM Development stages of incomplete horseshoes. (215) Christof Jung, Universidad Nacional Autonoma de Special Session on Differential Equations, Nonlinear Mexico (944-58-56) Analysis, and Numerical Solutions to PDEs, IV 4:00PM Dependence on parameters of SRB measures and (216) their thermodynamic limits in Coupled Map Lattices. 2:30 PM – 4:20 PM Room 413, University Union Miaohua Jiang, Wake-Forest University, and Rafael de la Llave*, Univ. of Texas at Austin (944-82-136) Organizers: John W. Neuberger, University of North Texas Alfredo C. Nicolas,UAM Special Session on Low Dimensional Topology, IV 2:30PM Sobolev Gradients and Nonlinearly Constrained (205) Optimization. 2:30 PM – 4:20 PM Room 212, Wooten Hall Javier Garza, Tarleton State University (944-49-23) 3:00PM Numerical Computation of a Visco-Elastic Fluid Organizers: Mark W. Brittenham, University of (206) Flow. Preliminary report. North Texas Edward J. Dean, University of Houston (944-65-32) Francisco Gonzalez Acuna,IM-UNAM 3:30PM Fast Computation of a Class of Radially Symmetric Luis Valdez-Sanchez, University of (207) Solutions of the 2D Navier-Stokes equation. Texas at El Paso Henrik O. Nordmark, UAM-Azcapotzalco 2:30PM Automorphisms of handlebodies and compression (944-65-66) (217) bodies. 4:00PM Simulation of Viscous Flows in Domains with Ulrich Oertel, Rutgers University (944-57-165) (208) Cylindrical Obstacles. 3:00PM Intersection Graphs and Dehn Surgery. Preliminary Lorenzo Hector Juarez-Valencia, Universidad (218) report. Autonoma Metropolitana-I (944-76-60) Cynthia J. Verjovsky Marcotte, The University of Texas at Austin (944-57-375) 3 Special Session on Algebraic Geometry and 3:30PM The 3-sphere as a cover of S branched over a knot. (219) Preliminary report. Commutative Algebra, IV Enrique Ramirez-Losada, Facultad de Ciencias, UNAM (944-57-246) 2:30 PM – 4:30 PM Room 417, University Union 4:00PM Surgery on knots which yield the same 3-manifold. Organizers: Javier Elizondo,UNAM (220) John K. Osoinach Jr., Eureka College (944-57-380) Xavier Gomez-Mont,CIMAT Alberto Corso, Michigan State University Special Session on Stochastic Processes, IV David A. Jorgensen, University of Texas at Arlington 2:30 PM – 4:20 PM Room 118, Wooten Hall 2:30PM On The Gauss-Manin Connection. Preliminary report. Organizers: Frederi G. Viens, University of North (209) Herbert Kanarek, Instituto de Matem´aticas, UNAM Texas (944-14-378) Jorge A. Leon, CINVESTAV 3:00PM Generalized Auslander Regular Algebras. Juan Ruiz de Chavez,UAM (210) Preliminary report. 2:30PM Double stochastic equations: Approximation and Roberto Mart´ınez-Villa, Instituto de Matem´aticas, (221) small perturbations. UNAM, M´exico (944-13-206) Tudor Constantin, CIMAT and U. of Bucharest 3:40PM Associated graded rings of normal ideals. (944-60-77) (211) Sam Huckaba, Florida State University, and 3:30PM Anticipating Integral Equations. Thomas Marley*, University of Nebraska-Lincoln (222) Jorge A. Leon*, CINVESTAV-IPN, and David (944-13-259) Nualart, Universitat de Barcelona (944-60-117) 4:10PM Divisors of a Rees Algebra. Preliminary report. 4:00PM A branching processes approach to blowup of (212) Susan E. Morey*, Southwest Texas State University,

I (223) semilinear equations. and Wolmer V. Vasconcelos, Rutgers University , CIMAT (944-60-79) (944-13-307) Jose Alfredo Lopez Mimbela

Special Session on Geometric and Symbolic Dynamical Special Session on Ring Theory, IV Systems, IV 2:30 PM – 4:20 PM Room 418, University Union 2:30 PM – 4:20 PM Room 115, Wooten Hall Organizers: Carlos Signoret-Poillon, UNAM-UAM Organizers: Luca Q. Zamboni, University of North Sergio Lopez-Permouth, Ohio Texas University Edgardo Ugalde, University of San Luis Ricardo Alfaro, University of Potosi Michigan-Flint

Appendix–32 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Friday, May 21 – Program of the Sessions

2:30PM Semiartinian Von Neumann regular rings with 4:30PM Center manifolds and normal forms in epidemic (224) prescribed poset of representatives of simple (236) models. modules. Preliminary report. Christopher M. Kribs-Zaleta, University of Texas at Giuseppe Bacellla, Universit`a di L’Auila Arlington (944-34-214) (944-16-290) 3:00PM Projective modules over semilocal rings. Special Session on Combinatorics and Combinatorial (225) Alberto Facchini, Universita` di Udine, Udine, Italy Geometry, IV (944-16-87) 3:30PM Symmetric radicals over Noetherian rings. 2:30 PM – 4:20 PM Room 213, Wooten Hall (226) Preliminary report. Karl A. Kosler, University of Wisconsin-Waukesha Organizers: Jorge Urrutia, IMATE-UNAM and (944-16-83) University of Ottawa Wlodzimierz Kuperberg, Auburn 4:00PM Nonsingular Semiperfect CS-Rings. (227) S. K. Jain, Ohio University, Pramod Kanwar*, University Truman State University, and Sergio R. 2:30PM Inequalities between Lattice Packing and Covering Lopez-Permouth, Ohio University (944-16-317) (237) Densities of Centrally Symmetric Plane Convex Bodies. Dan Ismailescu, Courant Institute of Mathematical Sciences, New York University (944-52-221) Special Session on Noncommutative Geometry, 3:10PM Subsets without Upper Bounds in Coxeter Groups Quantum Groups, and Applications, IV (238) under the Weak Order. Preliminary report. Debra J. Waugh, University of Texas of the Permian 2:30 PM – 4:30 PM Room 112, Wooten Hall Basin (944-05-48) Organizers: Micho Durdevich,UNAM Hanna Ewa Makaruk, Los Alamos Special Session on Smooth Dynamical Systems, IV National Laboratory Robert M. Owczarek, Los Alamos 2:30 PM – 4:20 PM Room 116, Wooten Hall National Laboratory Organizers: David A. Delatte, University of North 2:30PM On Biological and Hardware Neural Nets. Texas (228) Valeriu Beiu, Rose Research (944-68-347) Dan Mauldin, University of North 3:00PM Braided logic. Preliminary report. Texas

I (229) Mar´ıa Ernestina Ch´avez Rodr´ıguez and Zbigniew Jose Seade,UNAM *, Universidad Nacional Autonoma´ de Oziewicz Mariusz Urbanski, University of North ´ ´ Mexico, Facultad de Estudios Superiores Cuautitlan Texas Izcalli, Estado de M´exico (944-03-261) Alberto Verjovsky,UNAM 3:30PM Applications of quantum groups and (230) noncommutative geometry in physics, Part 1. 2:30PM Heteroclinic connections in mechanical systems with Robert M. Owczarek, Los Alamos National (239) cubic homogeneous potentials. Preliminary report. Laboratory (944-53-335) Ernesto A. Lacomba*, UAM-Iztapalapa, Mexico, and Manuel Falconi, UNAM (944-70-94) 4:00PM Symbolic Computations in Non-Commutative (231) geometry and Quantum Groups: Package in 3:00PM On countable number of limit cycles for generic 2 Mathematica. (240) polynomial differential equations in C . Hanna E. Makaruk*, Los Alamos National Laura Ortiz-Bobadilla, Ernesto Laboratory, and Micho Durdevich, Instituto de Rosales-Gonzalez*, National Autonomous Matematicas, Universidad Nacional Autonoma de University of Mexico, and Arsenii Shcherbakov, Mexico (944-20-334) Frumkin Inst. of Electrochemistry, Russian Academy of Sciences (944-34-171) 3:30PM Poincare-Hopf index and completeness for (241) Hamiltonian vector fields. Preliminary report. Special Session on Nonlinear Models in Biology and Jesus R. Mucino-Raymundo˜ , UNAM (944-34-275) Celestial Mechanics, II 4:00PM Numerical Calculation of Decay of Correlations. (242) Marek R. Rychlik, University of Arizona 2:30 PM – 4:50 PM Room 412, University Union (944-65-395) Organizers: Ernesto Perez-Chavela,UAM Jorge X. Velasco-Hernandez,UAM Special Session on Algebraic Topology, IV Mary E. Parrott, University of South Florida 2:30 PM – 4:20 PM Room 215, Wooten Hall Ernesto A. Lacomba,UAM Organizers: Frederick R. Cohen, University of 2:30PM Periodicity in a Dynamical Model of Phyllotaxis. Rochester (232) Pau Atela, Smith College (944-70-401) Samuel Gitler, University of Rochester 3:00PM Heteroclinic primary intersections and codimension Carlos Prieto,UNAM (233) one Melnikov method for volume preserving maps. 2:30PM The lower algebraic K theory of fuchsian groups. Hector E. Lomeli*, ITAM-MEXICO, and James D. (243) Ethan Berkove, U.S. Military Academy West Point, Meiss, University of Colorado (944-70-399) Daniel Juan Pineda*, UNAM, Inst. de Matematicas, 3:30PM Symbolic dynamics of the collinear three-body Unidad Morelia, and Kimberly Pearson,U.of (234) problem. Valparaiso, IN (944-55-84) Samuel R. Kaplan, Bowdoin College (944-70-416) 3:00PM Periodic Complexes and Group Actions. Preliminary 4:00PM Some Remarks on the Marchuk’s Model of the (244) report. (235) Inmune System. Alejandro Adem*, University of Wisconsin, and Jeff Cristobal Vargas, CINVESTAV-IPN (944-92-122) H. Smith, Purdue University (944-55-81)

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–33 Program of the Sessions – Denton, TX, Friday, May 21 (cont’d.)

3:30PM Steenrod Operations and Long Group Extensions. Dan Mauldin, University of North (245) Preliminary report. Texas Miguel A. Xicotencatl, Depto. de Matematicas del Jose Seade,UNAM CINVESTAV, Mexico. (944-55-216) Mariusz Urbanski, University of North 4:00PM Centers of Weyl groups versus centers of Lie Texas (246) groups. Preliminary report. Alberto Verjovsky,UNAM Clarence W. Wilkerson Jr., Purdue University (944-22-370) 8:00AM Hausdorff Dimension and Measure for Complex (255) Continued Fractions with Restricted Entries. Special Session on Complex Analysis, II Pawel Hanus, University of North Texas (944-30-411) 2:30 PM – 4:20 PM Room 111, Wooten Hall 8:30AM Talk #268 by V. Afraimovich is held jointly with this session in Room 255, ESSC. Organizers: E. Ramirez de Arellano, CINVESTAV 9:30AM New results on lifting ergodicity in affine John E. Fornaess, University of (256) extensions. Preliminary report. Michigan, Ann Arbor Mahesh G. Nerurkar, Rutgers University 2:30PM Functions and differential forms in Cm:anew (944-28-47)

I (247) approach. Preliminary report. 10:00AM Real planar polynomial foliations. Reynaldo Rocha-Ch´avez, Michael Shapiro*, (257) Xavier Jarque*andJaume Llibre, Universitat Instituto Polit´ecnico Nacional, Mexico City, Mexico, Autonoma de Barcelona, Catalonia, Spain and Frank Sommen, National Fund for Scientific (944-34-110) Research, Belgium (944-30-69) 10:30AM Hamiltonian Stability in the Plane. m 3:00PM Some new integral theorems in C . Preliminary (258) Xavier Jarque, UAB, Barcelona, and Zbigniew H.

I (248) report. Nitecki*, Tufts University (944-58-39) Reynaldo Rocha-Ch´avez*, Michael Shapiro, 11:00AM Positive Kolmogorov-Sinai entropy for the standard Instituto Polit´ecnico Nacional, Mexico, and Frank

I (259) map. Sommen, National Fund for Scientific Research, Oliver R. Knill, University of Texas (944-58-384) Belgium (944-30-70) 11:30AM Dynamical Properties of Continued Fraction Type 3:30PM Treatment of acoustic potentials in the plane by (260) Algorithms. I (249) hypercomplex methods. Preliminary report. Robert M. Burton, Oregon State University Marco Antonio Macias-Cedeno˜ *, and Michael (944-99-266) Shapiro, Instituto Polit´ecnico Nacional, Mexico (944-30-303) Special Session on Continuum Theory (in honor of the 4:00PM On a class of convolutions with kernels having 60th birthday of Professor Sam B. Nadler Jr.), V (250) singularities on a sphere. Preliminary report. Alexey N. Karapetyants, CINVESTAV-I.P.N. 8:30 AM – 11:50 AM Room 117, Wooten Hall (944-31-390) Organizers: Wayne Lewis, Texas Tech University Special Session on Differential Geometry and Sergio Macias,UNAM Geodesics, IV Alejandro Illanes,UNAM 8:30AM Embeddings of Chainable Continua into the Plane. 2:30 PM – 4:20 PM Room 214, Wooten Hall (261) Piotr Minc, Auburn University (944-54-217) Organizers: Phillip E. Parker, Wichita State 9:00AM Symmetric Products Which Are Products or Cones. University (262) Enrique Castaneda˜ , IMATE, UNAM. (944-54-164) Lilia Del Riego, Univ. Auto. de San Luis 9:30AM Spans of Certain Continua Cross Arcs. Potosi (263) Thelma R. West, University of Southwestern 2:30PM Geodesic Flows on the Oscillator Group. Louisiana (944-54-326) (251) Shirley T. Bromberg*, UAM-I (Mexico), and Alberto 10:00AM Generalized Whitney Properties. Preliminary report. Medina, UAM-I(Mexico), Umontp2 (France) (264) Fernando Orozco, IMATE, UNAM. (944-54-167) (944-83-223) 10:30AM Exactly k-to-1 mappings and hereditarily 3:00PM A generalized exponential map and Jacobi field for (265) indecomposable tree-like continua. (252) a non-linear connection. Preliminary report. Thomas E. Gonzalez, Auburn University Lilia Del Riego*, Univ. Aut. San Luis Potosi, and (944-54-353) Phillip E. Parker, Wichita State University 11:00AM Hyperspaces which are locally Euclidian at the top. (944-53-105) (266) Sergio Lopez´ , UNAM-UPN (944-54-144) 3:30PM A Finslerian Poincare disc. Preliminary report. 11:30AM Concerning continua that are Irreducible about

I (253) David Bao, University of Houston (944-53-209) (267) finitelymanypoints. 4:00PM On regular values for maps between graded David J. Ryden, Oklahoma State University (254) domains. Preliminary report. (944-54-258) Fausto Ongay, Centro de Investigacion´ en Matem´aticas (944-53-211) Meeting Registration

8:30 AM – NOON Lyceum Lobby, University Union Saturday, May 22 Special Session on Geometric and Symbolic Dynamical Systems, V Special Session on Smooth Dynamical Systems, V 8:30 AM – 11:50 AM Room 255, Eagle 8:00 AM – 11:50 AM Room 116, Wooten Hall Student Services Center Organizers: David A. Delatte, University of North Organizers: Luca Q. Zamboni, University of North Texas Texas

Appendix–34 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Saturday, May 22 – Program of the Sessions

Edgardo Ugalde, University of San Luis 9:00AM Stochastic Optimization Models in Incomplete Potosi (279) Markets. 8:30AM Some problems related to dimension–like Thaleia Zariphopoulou, University of (268) characteristics in dynamical systems. Wisconsin-Madison (944-60-278) Valentin Afraimovich, Universidad Autonoma de 10:00AM Hedging and Value at Risk in Markets with Frictions. San Luis Potosi (944-58-263) (280) Simon McNair*andThaleia Zariphopoulou, 9:30AM Symmetric fractals generated by a cellular University of Wisconsin-Madison (944-60-282) (269) automaton. 10:30AM Optimal adaptive tracking of functional Andre Barbe and Fritz von Haeseler*, K.U.Leuven (281) time-varying autoregressive models. ESAT/SISTA (944-28-362) Nadine Hilgert, CINVESTAV (944-93-168) 10:00AM Primitive substitutive sequences in minimal 11:00AM Nearly Optimal Stationary Policies in Negative (270) subshifts. Preliminary report. (282) Dynamic Programming. Charles G. Holton, University of California at Rolando Cavazos-Cadena, Departamento de Berkeley (944-51-394) Estadistica y Calculo,Universidad Autonoma Agraria 10:30AM Prefix-suffix automaton and realization of Antonio Narro, and Raul Montes-de-Oca*, Departamento de Matematicas,Universidad I (271) substitutions. Vincent Canterini, Institut de Mathematiques de Autonoma Metropolitana-Iztapalapa (944-93-274) Luminy, and Anne Siegel*, IML (944-99-152) 11:30AM Comparing solutions of SDEs pathwise. Applications. 11:00AM Geodesic laminations as geometric realizations of (283) Guillermo Ferreyra*andP. Sundar, Louisiana State (272) sequences of complexity 2n +1. University (944-93-153) Victor F. Sirvent, Universida Simon Bolivar (944-58-233) Special Session on Functional Analysis and Its 11:30AM Spectral decomposition of a class of Zd substitution Applications, V (273) tiling dynamical systems. Preliminary report. Natalie M. Priebe, Rensselaer Polytechnic Institute 9:00 AM – 11:20 AM Room 210, Wooten Hall (944-28-381) Organizers: S. Perez-Esteva,UNAM Josefina Alvarez, University of New Exhibits and Book Sale Mexico 9:00AM The dispersionless limit of the periodic Toda system 9:00 AM – NOON Silver Eagle Suites, University Union (284) and Toeplitz operators. Preliminary report. Alejandro Uribe, University of Michigan (944-35-297) Special Session on Representation Theory of 9:30AM Boundedness of certain convolution operators. Algebras, V (285) Magali Folch–Gabayet, IMUNAM (944-43-44) 10:00AM λ-central mean oscillation and λ-central Carleson 9:00 AM – 11:50 AM Room 411, University Union (286) measures. Josefina Alvarez, New Mexico State University, Organizers: Jose A. de la Pena,UNAM Martha Guzman-Partida*, Universidad de Sonora, Christof Geiss,UNAM and Joseph Lakey, New Mexico State University Birge Huisgen-Zimmerman, University (944-42-10) of California at Santa Barbara 10:30AM An application of spectral multiplicity theory to 9:30AM Representation Type of Commutative Noetherian (287) wavelets. Preliminary report. (274) Rings II: Tameness. Kathy D. Merrill, Colorado College (944-43-183) Lawrence S. Levy*, University of Wisconsin, and Lee 11:00AM An abstract interpretation of the wavelet dimension Klingler, Florida Atlantic University (944-13-333) (288) function. 10:00AM Matrix problems as relatively projective modules. Lawrence W. Baggett, University of Colorado (275) Preliminary report. (944-42-273) Mark Kleiner, Syracuse University (944-16-178) 10:30AM Opening Boxes. Special Session on Differential Equations, Nonlinear (276) Raymundo Bautista and Rita Zuazua*, Instituto de Analysis, and Numerical Solutions to PDEs, V Matematicas, UNAM (944-16-324) 11:00AM Bocses and Representations of k-Species. Preliminary 9:00 AM – 10:50 AM Room 413, University Union (277) report. Organizers: John W. Neuberger, University of Raymundo Bautista and Jesus Efren Perez*, North Texas Instituto de Matematicas UNAM (944-16-310) Alfredo C. Nicolas,UAM 11:30AM New Invariant Factors and Canonical Forms of (278) Matrices and Generalized Interlacing Inequalities. 9:00AM A Penalty Method for Finite Element Approximations Peter M. Joyce*, CCBC-Catonsville, and Nilotpal (289) of the Stationary Power-law Stokes Problem. Ghosh, CCBC (944-15-09) Lew E. Lefton*andDongming Wei, University of New Orleans (944-65-203) 9:30AM A Numerical Scheme for Natural Convection. Special Session on Stochastic Systems and Control, V (290) Preliminary report. Francisco Javier Sanchez*, Universidad Autonoma 9:00 AM – 11:55 AM Room 409, University Union Metropolitana-Iztapalapa, Blanca Bermudez, Benemerita Universidad Autonoma de Puebla, Organizers: Daniel Hernandez-Hernandez, and Alfredo Nicolas, Universidad Autonoma CINVESTAV Metropolitana-Iztapalapa (944-35-50) Onesimo Hernandez-Lerma, 10:00AM Computing the Spectrum of Sturm-Liouville CINVESTAV I (291) Problems with SLEIGN2. Guillermo Ferreyra, Louisiana State Anton Zettl, Northern Illinois University University (944-34-345)

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–35 Program of the Sessions – Denton, TX, Saturday, May 22 (cont’d.)

10:30AM Sobolev Preconditioning for Semiconductor 11:00AM The Topology of Recombination.

(292) Modeling. I (303) Isabel K. Darcy, University of Texas at Austin Walter B. Richardson Jr., UT San Antonio (944-92-329) (944-35-107) 11:30AM 3-Manifolds obtained by surgery on closed pure (304) 3-braids. Preliminary report. Lorena Armas-Sanabria, Instituto de Matematicas, Special Session on Algebraic Geometry and UNAM (944-57-385) Commutative Algebra, V Special Session on Stochastic Processes, V 9:00 AM – NOON Room 417, University Union 9:00 AM – 11:50 AM Room 118, Wooten Hall Organizers: Javier Elizondo,UNAM Xavier Gomez-Mont,CIMAT Organizers: Frederi G. Viens, University of North Alberto Corso, Michigan State Texas University Jorge A. Leon, CINVESTAV David A. Jorgensen, University of Juan Ruiz de Chavez,UAM Texas at Arlington 9:00AM Self-intersection of generalized Ornstein-Uhlenbeck 9:00AM On the classification of double meanders of (305) processess. (293) M-curves of degree 5. Luis G. Gorostiza, CINVESTAV-IPN (944-60-58) Anatoly B. Korchagin, Texas Tech University 10:00AM Self-intersection local time of the fluctuation limit of (944-14-25) (306) a multitype branching particle system. 9:30AM Noetherian domains inside a homomorphic image Ekaterina Todorova, CIMAT (944-60-61) (294) of a completion I. 10:30AM A Particle System on the Tree with Surprising William Heinzer, Purdue University, Christel (307) Asymptotic Behavior. Preliminary report. Rotthaus, Michigan State University, and Sylvia M. Shirin Joy Handjani, University of Mississippi Wiegand*, University of Nebraska (944-13-280) (944-60-257) 10:05AM Noetherian domains inside a homomorphic image 11:00AM A branching particle system for transport of (295) of a completion II. Preliminary report. (308) pollutants. Preliminary report. Heinzer William, Purdue University, Christel Luis G. Gorostiza, CINVESTAV-IPN, and Eliane R. Rotthaus*, Michigan State University, and Sylvia Rodrigues*, IMATE-UNAM (944-60-160) Wiegand, University of Nebraska (944-13-248) 11:30AM Modeling inhomogeneous random media. 10:40AM Some results on rational surfaces and Fano (309) John A. Quintanilla*, University of North Texas, and (296) varieties. Sal Torquato, Princeton University (944-60-118) Bangere P. Purnaprajna*, University of Kansas, and Francisco J. Gallego, Universidad Complutense de Special Session on Ring Theory, V Madrid (944-14-382) 11:10AM Serre’s Multiplicity Conjectures for Connected 9:00 AM – 10:30 AM Room 418, University Union (297) Algebras. Organizers: Carlos Signoret-Poillon, UNAM-UAM Izuru Mori, University of Texas at Arlington (944-16-201) Sergio Lopez-Permouth, Ohio University 11:40AM Normalization of toric varieties. Preliminary report. (298) Joseph P. Brennan, North Dakota State University Ricardo Alfaro, University of (944-13-364) Michigan-Flint 9:00AM CS modules and rings with chain conditions. (310) Dinh V. Huynh, Institute of Mathematics, Hanoi, Special Session on Low Dimensional Topology, V Vietnam/ Ohio University at Athens (944-16-404) 9:30AM Local Krull-Gabriel dimension. 9:00 AM – 11:50 AM Room 212, Wooten Hall (311) Ivo Herzog, The Ohio State University at Lima (944-16-408) Organizers: Mark W. Brittenham, University of North Texas 10:00AM Discussion. Francisco Gonzalez Acuna,IM-UNAM Special Session on Noncommutative Geometry, Luis Valdez-Sanchez, University of Quantum Groups, and Applications, V Texas at El Paso 9:00AM Cutting and pasting immersed surfaces. Preliminary 9:00 AM – NOON Room 112, Wooten Hall (299) report. Max Neumann-Coto, Universidad Nacional Organizers: Micho Durdevich,UNAM Autonoma de Mexico (944-57-379) Hanna Ewa Makaruk, Los Alamos National Laboratory 9:30AM Experimenting with the involutory Kuperberg (300) invariant using structure coefficients in Gelacki’s Robert M. Owczarek, Los Alamos Hopf algebras. Preliminary report. National Laboratory Fernando J. O. Souza*, Louis H. Kauffman and 9:00AM A Hopf bar-operation for quantum Sl2 with q of David E. Radford, University of Illinois at Chicago (312) modulus one: A possible step in a basic construction (944-57-352) of the standard model? 10:00AM A new proof of Johannson’s Deformation Theorem. Daniel Kastler, CPT-Universite de la Mediterranee, (301) Preliminary report. AIX-Marseille II (944-16-298) Peter Scott*, University of Michigan, and Gadde A. 10:00AM On quantized envelopings of Lie algebras. Swarup, University of Melbourne (944-57-367) (313) Vladislav Kharchenko, FES-Cuautitlan (944-16-251) 10:30AM Finiteness Results for Heegaard Surfaces in 10:50AM All under one roof—Recent developments on cross (302) Surgered Manifolds. (314) product bialgebras. Yo’av Rieck*andEric Sedgwick, Oklahoma State Bernhard Drabant, DAMTP-University of Cambridge University (944-57-306) (944-16-360)

Appendix–36 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Saturday, May 22 – Program of the Sessions

11:40AM Applications of quantum groups and Special Session on Algebraic Topology, V (315) noncommutative geometry in physics, Part 2. Robert M. Owczarek, Los Alamos National 9:00 AM – 11:50 AM Room 215, Wooten Hall Laboratory (944-53-421) Organizers: Frederick R. Cohen, University of Rochester Samuel Gitler, University of Rochester Carlos Prieto,UNAM Special Session on Nonlinear Models in Biology and Celestial Mechanics, III 9:00AM Essential equivariant maps and Borsuk-Ulam (326) theorems. Monica´ Clapp*, UNAM, and Waclaw Marzantowicz, 9:00 AM – 12:30 PM Room 412, University Union A. Mickiewicz University (944-55-232) Organizers: Ernesto Perez-Chavela,UAM 10:00AM The Classifying Space of an Orbifold and Some Jorge X. Velasco-Hernandez,UAM (327) Applications. Charles P. Boyer, University of New Mexico Mary E. Parrott, University of South (944-55-218) Florida 10:30AM Fixed point theory and framed cobordism. Ernesto A. Lacomba,UAM (328) Preliminary report. 9:00AM Dynamics of the domain in biological pattern Carlos Prieto, Instituto de Matema´ticas, UNAM (316) formation modeling. (944-55-91) Faustino Sanchez, UNAM (944-92-123) 11:00AM Bockstein Operators on the Kirby-Siebenmann Class. 10:00AM A qualitative mathematical model of the motor (329) Duane Randall, Loyola University, New Orleans (317) circadian rhythm in crayfish. (944-55-22) Miguel Lara-Aparicio, UNAM (944-92-121) 11:30AM Quasifibrations and Bott periodicity.

10:30AM A model for Hepatitis C. I (330) Marcelo A. Aguilar*andCarlos Prieto,UNAM (318) Lourdes Esteva-Peralta, UNAM (944-92-124) (944-55-197) 11:00AM Antimonotonicity in Hamiltonian Systems: Generic (319) Twistless Bifurcations. Special Session on Complex Analysis, III James D. Meiss, University of Colorado at Boulder (944-58-418) 9:00 AM – 10:50 AM Room 111, Wooten Hall 11:30AM Heteroclinical connections on the triple collision (320) manifold. Organizers: E. Ramirez de Arellano, CINVESTAV Antoni Susin*, UPC-Spain, and Carles Simo, John E. Fornaess, University of Universidad de Barcelona (944-70-400) Michigan, Ann Arbor 12:10PM On a continuous of central configurations in a 9:00AM Majorant series. Preliminary report. (321) charged problem. (331) Harold P. Boas, Texas A&M University (944-30-202) Feleipe Alfaro*andErnesto Perez-Chavela, 9:30AM The Shape of the Ford Domains for the Hecke

UAM-Iztapalapa (944-70-376) I (332) Congruence Subgroups. Antonio Lascurain Orive, Universidad Nacional Autonoma´ de M´exico (944-30-268) 10:00AM The Harmonic Extension of Quasihomographies.

Special Session on Combinatorics and Combinatorial I (333) Preliminary report. Lino F. Res´endis O., Universidad Autonoma´ Geometry, V Metropolitana-Azc. (944-30-172)

9:00 AM – 11:30 AM Room 213, Wooten Hall 10:30AM Numerical conformal mapping via interpolating

I (334) polynomials. Organizers: Jorge Urrutia, IMATE-UNAM and R. Michael Porter,Depto.deMatem´aticas, University of Ottawa CINVESTAV-I.P.N. (944-30-86) Wlodzimierz Kuperberg, Auburn University Special Session on Differential Geometry and 9:00AM Compass Routing on Geometric Networks. Geodesics, V (322) Evangelos Kranakis, Carleton University, Harvinder Singh and Jorge Urrutia*, University of 10:00 AM – 11:50 AM Room 214, Wooten Hall Ottawa (944-05-396) Organizers: Phillip E. Parker, Wichita State 9:40AM Structural Results for Planar Sets with many University (323) Equilateral Triangles. Preliminary report. Bernardo M. Abrego*, Rutgers University, Lilia Del Riego, Univ. Auto. de San Luis Gyorgy Elekes, Eotvos University, and Silvia Potosi Fernandez-Merchant, Rutgers University 10:00AM Geometry of 2-step nilpotent Lie groups. Preliminary (944-05-300) (335) report. Patrick B. Eberlein, University of North Carolina at 10:20AM Iterated Clique Graphs and Tic, Tac, Toe Reduction. Chapel Hill (944-53-98)

I (324) Preliminary report. Martin Eduardo Frias-Armenta*, Instituto de 10:30AM Discussion. Matematicas-Facultad de Ciencias-UNAM, 11:00AM Isometry groups of 2-step nilspaces. Preliminary and Victor Neumann-Lara, Instituto de (336) report. Matematicas-UNAM (944-05-422) Phillip E. Parker*, Wichita State Univ., and Luis A. 11:00AM On unit circles which avoid all but two points of a Cordero, Universidade de Santiago (944-53-402) (325) given pointset. 11:30AM Poisson Homogeneous Spaces of a Poisson-Lie

Andr´as Bezdek, Auburn University, AL and I (337) Group. Hungarian Academy of Sciences, Budapest Alberto Medina, UAM-I(Mexico), UMont2 (France) (944-52-198) (944-53-222)

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–37 Program of the Sessions – Denton, TX, Saturday, May 22 (cont’d.)

Special Session on Smooth Dynamical Systems, VI 3:00PM Linear Extension of Nonlinear Semigroups. (349) J. W. Neuberger*, University of North Texas, and J. 1:00 PM – 3:50 PM Room 116, Wooten Hall R. Dorroh, LSU (944-46-71) Organizers: David A. Delatte, University of North Texas Special Session on Continuum Theory (in honor of the 60th birthday of Professor Sam B. Nadler, Jr.), VI Dan Mauldin, University of North Texas 1:30 PM – 3:30 PM Room 117, Wooten Hall Jose Seade,UNAM Organizers: Wayne Lewis, Texas Tech University Mariusz Urbanski, University of North Texas Sergio Macias,UNAM Alberto Verjovsky,UNAM Alejandro Illanes,UNAM 1:00PM Absolutely Continuous Invariant Measures for C1 1:30PM Homeomorphisms of a Solenoid Homotopic to the (338) Expanding Maps. (350) Identity. Preliminary report. Anthony N. Quas, University of Memphis Alex D. Clark, University of North Texas (944-58-43) (944-58-372) 1:30PM Trajectory of the turning point is dense for a 2:00PM A homogeneous arcwise connected, non-locally (339) co-σ -porous set of tent maps. (351) connected continuum. Preliminary report. Karen M. Brucks*, UWM-Milwaukee, and Zolt´an Janusz R. Prajs, Texas Tech University Buczolich,Eotv¨ os¨ Lor´and University (944-99-130) (944-54-235) 2:00PM Non-Collet-Eckmann maps and decay of 2:30PM The Plane Fixed Point Problem. (340) correlations. (352) Vladimir N. Akis, California State University, Los Henk Bruin, Caltech (944-28-113) Angeles (944-53-125) 2:30PM Pointwise Dimension of Attractors of Iterated 3:00PM Open problems. (341) Function Systems. Brian R. Hunt, University of Maryland, College Park Special Session on Differential Equations, Nonlinear (944-28-369) Analysis, and Numerical Solutions to PDEs, VI 3:00PM Substitutions in Life. Preliminary report. 1:30 PM – 2:50 PM Room 413, University Union

I (342) William Geller and Michal Misiurewicz*, IUPUI (944-58-227) Organizers: John W. Neuberger, University of 3:30PM The Multi-port Volterra Series for Modeling of North Texas (343) Smooth Dynamic Systems. Alfredo C. Nicolas,UAM Denis N. Sidorov, Energy Systems Institute 1:30PM Analysis of the asymptotic behavior of semigroups (944-45-49) (353) generated by partial differential equations. Peter Seibert and Juan H. Arredondo, R*, Special Session on Representation Theory of Universidad Autonoma Metropolitana (944-35-249) Algebras, VI 2:00PM Chebyshev pseudospectral-finite element method (354) for two-dimensional unsteady Navier-Stokes 1:30 PM – 2:50 PM Room 411, University Union equation. Preliminary report. Jingyu Hou*, Univ.of Southern Queensland, and Organizers: Jose A. de la Pena,UNAM Benyu Guo, Shanghai University (944-65-145) Christof Geiss,UNAM 2:30PM The Kite Method for Accelerating Vortex Method Birge Huisgen-Zimmerman, University (355) Solutions of Euler’s and Navier-Stokes’ Equations. of California at Santa Barbara Randall E. Rausch, Raytheon Systems Company 1:30PM Non-Noetherian Down-Up Algebras. (944-76-21) (344) Ellen E. Kirkman*andJames J. Kuzmanovich, Wake Forest University (944-16-265) Special Session on Geometric and Symbolic Dynamical 2:00PM Discussion. Systems, VI 2:30PM On Reflexivity of Direct Sums. (345) Victor P. Camillo and Kent R. Fuller*, University of 1:30 PM – 2:50 PM Room 115, Wooten Hall Iowa (944-16-199) Organizers: Luca Q. Zamboni, University of North Texas Special Session on Functional Analysis and Its Edgardo Ugalde, University of San Luis Applications, VI Potosi 1:30PM An alternative construction of normal numbers. 1:30 PM – 3:20 PM Room 210, Wooten Hall (356) Edgardo Ugalde, Universidad Autonoma de San Organizers: S. Perez-Esteva,UNAM Luis Potosi (944-11-264) Josefina Alvarez, University of New 2:00PM Non-integer bases, kneading sequences, and a Mexico (357) self-similar arithmetic set. Jean-Paul S. Allouche, CNRS (944-11-192) 1:30PM An analogue of Paley-Wiener Theorem for White (346) Noise Analysis. 2:30PM Irrational Dilations of Pascal’s Triangle (joint with Aurel I. Stan, Louisiana State University (358) D. Berend and G. Kosesnik). (944-46-328) Michael D. Boshernitzan, Rice University (944-11-371) 2:00PM Uncertainty principles and Poisson summation. (347) Joseph D. Lakey, NMSU (944-42-157) Special Session on Low Dimensional Topology, IV 2:30PM On the convergence of series of translates of a (348) function. Preliminary report. 1:30 PM – 3:20 PM Room 212, Wooten Hall R. Daniel Mauldin*, University of North Texas, Jean Pierre Kahane, Universite de Paris-Sud, and Zoltan Organizers: Mark W. Brittenham, University of Buczolich, Eotvos Lorand University (944-46-294) North Texas

Appendix–38 NOTICES OF THE AMS VOLUME 46, NUMBER 6 Denton, TX, Saturday, May 22 – Program of the Sessions

Francisco Gonzalez Acuna,IM-UNAM Samuel Gitler, University of Rochester Luis Valdez-Sanchez, University of Carlos Prieto,UNAM Texas at El Paso 1:30PM The Adelic Grassmannian. 1:30PM Truly universal links. Preliminary report. (369) Ernesto Lupercio, University of Michigan, (359) Victor Nu´nez˜ , CIMAT (944-57-215) CINVESTAV - ESFM-IPN (944-55-207) 2:00PM The topology of deformation spaces of hyperbolic 2:30PM Stability of holomorphic spheres and Morse theory. (360) 3-manifolds. (370) Preliminary report. James W. Anderson, University of Southampton, Ralph L. Cohen, Stanford University (944-57-190) Richard D. Canary, University of Michigan, and 3:00PM A report on the structure of the higher dimensional Darryl McCullough*, University of Oklahoma I (371) Cayley-Dickson algebras. (944-57-119) Guillermo Moreno, Depto. de Matematicas del 2:30PM Normal forms for basis conjugating automorphisms CINVESTAV, Mexico. (944-55-173) (361) of a free group. Mauricio Gutierrez, Tufts University (944-20-357) Special Session on Differential Geometry and 3:00PM Finding Planar Surfaces and the Word Problem. Geodesics, VI (362) William H. Jaco*, Eric Sedgwick, Oklahoma State University, and Joachim H. Rubinstein, University 1:30 PM – 3:30 PM Room 214, Wooten Hall of Melbourne (944-57-336) Organizers: Phillip E. Parker, Wichita State University Special Session on Stochastic Processes, VI Lilia Del Riego, Univ. Auto. de San Luis Potosi 1:30 PM – 3:20 PM Room 118, Wooten Hall 1:30PM Informal discussions. Organizers: Frederi G. Viens, University of North Texas Invited Address Jorge A. Leon, CINVESTAV 4:00 PM – 5:00 PM Lyceum, University Union Juan Ruiz de Chavez,UAM 1:30PM A brief survey of white noise analysis. (372) Unsolvable problems about knots and related (363) Hui-Hsiung Kuo, Louisiana State University groups. Preliminary report. (944-60-146) Francisco J. Gonzalez-Acuna˜ , Instituto de 2:30PM Stochastic approach to quantum tunneling. Matematicas,UNAM (944-57-245) (364) Chebotarev Alexander, Quantum Statistics Department, Moscow State University, and Quezada Closing Ceremonies and Banquet Roberto*, Departamento de Matema´ticas, UAM-Iztapalapa, Mexico City (944-60-52) 6:30 PM – 10:30 PM Golden Eagle Suite, University Union 3:00PM Unbounded completely positive maps and Cash Bar Reception at 6:30 p.m.; Dinner served at (365) conservativity of quantum dynamical semigroups. 7:00 p.m. Preliminary report. Julio C. Garc´ia*andRobertoB.Quezada, Lesley M. Sibner Universidad Autonoma´ Metropolitana, Iztapalapa. Associate Secretary (944-60-41) Brooklyn, New York

Special Session on Noncommutative Geometry, Quantum Groups, and Applications, VI

1:30 PM – 3:40 PM Room 112, Wooten Hall Organizers: Micho Durdevich,UNAM Hanna Ewa Makaruk, Los Alamos National Laboratory Robert M. Owczarek, Los Alamos National Laboratory 1:30PM On quantum Lie algebras and the PBW theorem. (366) Cesar Bautista, Facultad de Ciencias de la Computacion, BUAP (944-16-252) 2:20PM Yang-Baxter operators on ε-commutative algebras (367) and quantum minors. Preliminary report. Carles Victoria-Monge*, UPC-Barcelona, and Oscar A. Sanchez-Valenzuela, CIMAT & SMM (944-16-150) 3:00PM Bilinear Generating Functions For The Continuous (368) q-Hermite Polynomials. Natig Atakishiyev*, Institute of Mathematics-Cuernavaca, UNAM, and M. K. Atakishiyeva, Facultad de Ciencias, UAEM (944-33-255)

Special Session on Algebraic Topology, VI

1:30 PM – 3:20 PM Room 215, Wooten Hall Organizers: Frederick R. Cohen, University of Rochester

JUNE/JULY 1999 NOTICES OF THE AMS Appendix–39