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On S-Topological Groups
Mathematica Moravica Vol. 18-2 (2014), 35–44 On s-Topological Groups Muhammad Siddique Bosan, Moiz ud Din Khan and Ljubiša D.R. Kočinac∗) Abstract. In this paper we study the class of s-topological groups and a wider class of S-topological groups which are defined by us- ing semi-open sets and semi-continuity introduced by N. Levine. It is shown that these groups form a generalization of topological groups, and that they are different from several distinct notions of semitopolog- ical groups which appear in the literature. Counterexamples are given to strengthen these concepts. Some basic results and applications of s- and S-topological groups are presented. Similarities with and differ- ences from topological groups are investigated. 1. Introduction If a set is endowed with algebraic and topological structures, then it is natural to consider and investigate interplay between these two structures. The most natural way for such a study is to require algebraic operations to be continuous. It is the case in investigation of topological groups: the multi- plication mapping and the inverse mapping are continuous. Similar situation is with topological rings, topological vector spaces and so on. However, it is also natural to see what will happen if some of algebraic operations sat- isfy certain weaker forms of continuity. Such a study in connection with topological groups started in the 1930s and 1950s and led to investigation of semitopological groups (the multiplication mapping is separately con- tinuous), paratopological groups (the multiplication is jointly continuous), quasi-topological groups (which are semitopological groups with continu- ous inverse mapping). -
Functorial Constructions in Paratopological Groups Reflecting Separation Axioms
Functorial constructions in paratopological groups reflecting separation axioms Mikhail Tkachenko Universidad Aut´onomaMetropolitana, Mexico City [email protected] Brazilian Conference on General Topology and Set Theory S~aoSebasti~ao,Brazil, 2013 In honor of Ofelia T. Alas Contents: 1. Three known functorial constructions 2. Each axiom of separation has its functorial reflection 3. `Internal' description of the groups Tk (G) 4. Properties of the functors Tk 's 5. Products and functors 6. Some applications A paratopological group is a group G with topology such that multiplication in G is jointly continuous. `topological' =) `paratopological' =) `semitopological' Let (G; τ) be a paratopological group and τ −1 = fU−1 : U 2 τg be the conjugate topology of G. Then G 0 = (G; τ −1) is also a paratopological group and the inversion in G is a homeomorphism of (G; τ) onto (G; τ −1). Let τ ∗ = τ _ τ −1 be the least upper bound of τ and τ −1. Then G ∗ = (G; τ ∗) is a topological group associated to G. ∗ For the Sorgenfrey line S, the topological group S is discrete. Paratopological and semitopological groups A semitopological group is an abstract group G with topology τ such that the left and right translations in G are continuous or, equivalently, multiplication in G is separately continuous. `topological' =) `paratopological' =) `semitopological' Let (G; τ) be a paratopological group and τ −1 = fU−1 : U 2 τg be the conjugate topology of G. Then G 0 = (G; τ −1) is also a paratopological group and the inversion in G is a homeomorphism of (G; τ) onto (G; τ −1). -
Syllabus for M.Phil
Structure of Syllabus for M.Phil. in Mathematics Semester-I Full Full Full Full Course Course Code Course Name Marks Marks Marks Marks Credit Type (External) (Practical) (Internal) (Total) Research Methodology: MPHILMA-101 Theory Research Foundation 20 5 25 2 Research Methodology: Computer Application in MPHILMA-102 Practical 20 5 25 2 Research Elective: Any two papers to be chosen from Table-I, 40 10 50 4 based on research interest of MPHILMA-103 Theory + + + + the students and availability of suitable teachers/ 40 10 50 4 Supervisors. Total 120 30 150 12 Semester-II Full Full Full Full Course Course Code Course Name Marks Marks Marks Marks Credit Type (External) (Practical) (Internal) (Total) Elective: Any three papers to 40 10 50 4 be chosen from Table-II, + + + + MPHILMA-201 Theory based on research interest of 40 10 50 4 the students and availability of + + + + suitable teachers/Supervisors. 40 10 50 4 Total 120 30 150 12 Semester-III Full Full Full Full Course Course Code Course Name Marks Marks Marks Marks Credit Type (External) (Practical) (Internal) (Total) Preliminary MPHILMA-301 Theory 75 75 6 Dissertation MPHILMA-302 Theory Viva-voce 25 25 2 Total 100 100 8 Semester-IV Full Full Full Full Course Course Code Course Name Marks Marks Marks Marks Credit Type (External) (Practical) (Internal) (Total) MPHILMA-401 Theory Final Dissertation 75 75 6 MPHILMA-402 Theory Viva-voce 25 25 2 Total 100 100 8 Table: I Elective Papers for MPHILMA-103 (M1) to MPHILMA-103 (M18) Elective Paper Title of the Paper Sub-Code M1 Theory of Convergence -
Publication List, Dated 2010
References [1] V. A. Voevodski˘ı. Galois group Gal(Q¯ =Q) and Teihmuller modular groups. In Proc. Conf. Constr. Methods and Alg. Number Theory, Minsk, 1989. [2] V. A. Voevodski˘ıand G. B. Shabat. Equilateral triangulations of Riemann surfaces, and curves over algebraic number fields. Dokl. Akad. Nauk SSSR, 304(2):265{268, 1989. [3] G. B. Shabat and V. A. Voevodsky. Drawing curves over number fields. In The Grothendieck Festschrift, Vol. III, volume 88 of Progr. Math., pages 199{227. Birkh¨auser Boston, Boston, MA, 1990. [4] V. A. Voevodski˘ı. Etale´ topologies of schemes over fields of finite type over Q. Izv. Akad. Nauk SSSR Ser. Mat., 54(6):1155{1167, 1990. [5] V. A. Voevodski˘ı. Flags and Grothendieck cartographical group in higher dimensions. CSTARCI Math. Preprints, (05-90), 1990. [6] V. A. Voevodski˘ı.Triangulations of oriented manifolds and ramified coverings of sphere (in Russian). In Proc. Conf. of Young Scientists. Moscow Univ. Press, 1990. [7] V. A. Voevodski˘ı and M. M. Kapranov. 1-groupoids as a model for a homotopy category. Uspekhi Mat. Nauk, 45(5(275)):183{184, 1990. [8] V. A. Voevodski˘ıand M. M. Kapranov. Multidimensional categories (in Russian). In Proc. Conf. of Young Scientists. Moscow Univ. Press, 1990. [9] V. A. Voevodski˘ıand G. B. Shabat. Piece-wise euclidean approximation of Jacobians of algebraic curves. CSTARCI Math. Preprints, (01-90), 1990. [10] M. M. Kapranov and V. A. Voevodsky. Combinatorial-geometric aspects of polycategory theory: pasting schemes and higher Bruhat orders (list of results). Cahiers Topologie G´eom.Diff´erentielle Cat´eg., 32(1):11{27, 1991. -
Algebraic K-Theory (University of Washington, Seattle, 1997) 66 Robert S
http://dx.doi.org/10.1090/pspum/067 Selected Titles in This Series 67 Wayne Raskind and Charles Weibel, Editors, Algebraic K-theory (University of Washington, Seattle, 1997) 66 Robert S. Doran, Ze-Li Dou, and George T. Gilbert, Editors, Automorphic forms, automorphic representations, and arithmetic (Texas Christian University, Fort Worth, 1996) 65 M. Giaquinta, J. Shatah, and S. R. S. Varadhan, Editors, Differential equations: La Pietra 1996 (Villa La Pietra, Florence, Italy, 1996) 64 G. Ferreyra, R. Gardner, H. Hermes, and H. Sussmann, Editors, Differential geometry and control (University of Colorado, Boulder, 1997) 63 Alejandro Adem, Jon Carlson, Stewart Priddy, and Peter Webb, Editors, Group representations: Cohomology, group actions and topology (University of Washington, Seattle, 1996) 62 Janos Kollar, Robert Lazarsfeld, and David R. Morrison, Editors, Algebraic geometry—Santa Cruz 1995 (University of California, Santa Cruz, July 1995) 61 T. N. Bailey and A. W. Knapp, Editors, Representation theory and automorphic forms (International Centre for Mathematical Sciences, Edinburgh, Scotland, March 1996) 60 David Jerison, I. M. Singer, and Daniel W. Stroock, Editors, The legacy of Norbert Wiener: A centennial symposium (Massachusetts Institute of Technology, Cambridge, October 1994) 59 William Arveson, Thomas Branson, and Irving Segal, Editors, Quantization, nonlinear partial differential equations, and operator algebra (Massachusetts Institute of Technology, Cambridge, June 1994) 58 Bill Jacob and Alex Rosenberg, Editors, K-theory and algebraic geometry: Connections with quadratic forms and division algebras (University of California, Santa Barbara, July 1992) 57 Michael C. Cranston and Mark A. Pinsky, Editors, Stochastic analysis (Cornell University, Ithaca, July 1993) 56 William J. Haboush and Brian J. -
Extensions of Topological and Semitopological Groups and the Product Operation
Commentationes Mathematicae Universitatis Carolinae Aleksander V. Arhangel'skii; Miroslav Hušek Extensions of topological and semitopological groups and the product operation Commentationes Mathematicae Universitatis Carolinae, Vol. 42 (2001), No. 1, 173--186 Persistent URL: http://dml.cz/dmlcz/119232 Terms of use: © Charles University in Prague, Faculty of Mathematics and Physics, 2001 Institute of Mathematics of the Academy of Sciences of the Czech Republic provides access to digitized documents strictly for personal use. Each copy of any part of this document must contain these Terms of use. This paper has been digitized, optimized for electronic delivery and stamped with digital signature within the project DML-CZ: The Czech Digital Mathematics Library http://project.dml.cz Comment.Math.Univ.Carolin. 42,1 (2001)173–186 173 Extensions of topological and semitopological groups and the product operation A.V. Arhangel’skii, M. Huˇsek Abstract. The main results concern commutativity of Hewitt-Nachbin realcompactifica- tion or Dieudonn´ecompletion with products of topological groups. It is shown that for every topological group G that is not Dieudonn´ecomplete one can find a Dieudonn´e complete group H such that the Dieudonn´ecompletion of G × H is not a topological group containing G×H as a subgroup. Using Korovin’s construction of Gδ-dense orbits, we present some examples showing that some results on topological groups are not valid for semitopological groups. Keywords: topological group, Dieudonn´ecompletion, PT-group, realcompactness, Moscow space, C-embedding, product Classification: 22A05, 54H11, 54D35, 54D60 §0. Introduction Although many of our general results are valid for more general spaces, we shall assume that all the spaces under consideration are Tychonoff. -
Quillen's Work in Algebraic K-Theory
J. K-Theory 11 (2013), 527–547 ©2013 ISOPP doi:10.1017/is012011011jkt203 Quillen’s work in algebraic K-theory by DANIEL R. GRAYSON Abstract We survey the genesis and development of higher algebraic K-theory by Daniel Quillen. Key Words: higher algebraic K-theory, Quillen. Mathematics Subject Classification 2010: 19D99. Introduction This paper1 is dedicated to the memory of Daniel Quillen. In it, we examine his brilliant discovery of higher algebraic K-theory, including its roots in and genesis from topological K-theory and ideas connected with the proof of the Adams conjecture, and his development of the field into a complete theory in just a few short years. We provide a few references to further developments, including motivic cohomology. Quillen’s main work on algebraic K-theory appears in the following papers: [65, 59, 62, 60, 61, 63, 55, 57, 64]. There are also the papers [34, 36], which are presentations of Quillen’s results based on hand-written notes of his and on communications with him, with perhaps one simplification and several inaccuracies added by the author. Further details of the plus-construction, presented briefly in [57], appear in [7, pp. 84–88] and in [77]. Quillen’s work on Adams operations in higher algebraic K-theory is exposed by Hiller in [45, sections 1-5]. Useful surveys of K-theory and related topics include [81, 46, 38, 39, 67] and any chapter in Handbook of K-theory [27]. I thank Dale Husemoller, Friedhelm Waldhausen, Chuck Weibel, and Lars Hesselholt for useful background information and advice. 1. -
An Introduction to Topological Groups
An Introduction to Topological Groups by Dylan Spivak A project submitted to the Department of Mathematical Sciences in conformity with the requirements for Math 4301 (Honours Seminar) Lakehead University Thunder Bay, Ontario, Canada copyright c (2015) Dylan Spivak Abstract This project is a survey of topological groups. Specifically, our goal is to investigate properties and examples of locally compact topological groups. Our project is structured as follows. In Chapter 2, we review the basics of topology and group theory that will be needed to understand topological groups. This summary in- cludes definitions and examples of topologies and topological spaces, continuity, the prod- uct topology, homeomorphism, compactness and local compactness, normal subgroups and quotient groups. In Chapter 3, we discuss semitopological groups. This includes the left and right translations of a group G, the left and right embeddings of G, products of semitopological groups and compact semitopological groups. Chapter 4 is on topological groups, here we discuss subgroups, quotient groups, and products of topological groups. We end the project with locally compact topological groups; here we investigate compact- ness and local compactness in topological groups. An important class of locally compact topological groups are groups of matrices. These structures are important in physics, we go over some of their basic properties. i Acknowledgements I would like to thank my supervisor Dr. Monica Ilie for taking the time to meet with me every week, for carefully editing all of my proofs, and for working with me during the summer. Her kindness and experience made this project a pleasure to work on. I would also like to thank Dr. -
Topological Games and Topological Groups ✩
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector Topology and its Applications 109 (2001) 157–165 Topological games and topological groups ✩ Petar S. Kenderov 1,IvayloS.Kortezov1,WarrenB.Moors∗ Department of Mathematics, The University of Waikato, Private Bag 3105, Hamilton, New Zealand Received 25 May 1998; received in revised form 29 June 1999 Abstract A semitopological group (topological group) is a group endowed with a topology for which multiplication is separately continuous (multiplication is jointly continuous and inversion is continuous). In this paper we give some topological conditions on a semitopological group that imply that it is a topological group. In particular, we show that every almost Cech-completeˇ semitopological group is a topological group. Thus we improve some recent results of A. Bouziad. 2001 Elsevier Science B.V. All rights reserved. Keywords: Semitopological group; Topological group; Separate continuity; Joint continuity; Topological games; Quasi-continuity AMS classification: 22A20; 54E18; 54H15; 57S25 1. Introduction The purpose of this note is to refine and improve upon some of the recent advances made by Bouziad on the question of when a semitopological group is in fact a topological group. Recall that a semitopological group (paratopological group) is a group endowed with a topology for which multiplication is separately (jointly) continuous. Research on this question possibly began in [13] when Montgomery showed that each completely metrizable semitopological group is a paratopological group. Later in 1957 Ellis showed that each locally compact semitopological group is in fact a topological group (see [5,6]). -
Emissary | Spring 2021
Spring 2021 EMISSARY M a t h e m a t i c a lSc i e n c e sRe s e a r c hIn s t i t u t e www.msri.org Mathematical Problems in Fluid Dynamics Mihaela Ifrim, Daniel Tataru, and Igor Kukavica The exploration of the mathematical foundations of fluid dynamics began early on in human history. The study of the behavior of fluids dates back to Archimedes, who discovered that any body immersed in a liquid receives a vertical upward thrust, which is equal to the weight of the displaced liquid. Later, Leonardo Da Vinci was fascinated by turbulence, another key feature of fluid flows. But the first advances in the analysis of fluids date from the beginning of the eighteenth century with the birth of differential calculus, which revolutionized the mathematical understanding of the movement of bodies, solids, and fluids. The discovery of the governing equations for the motion of fluids goes back to Euler in 1757; further progress in the nineteenth century was due to Navier and later Stokes, who explored the role of viscosity. In the middle of the twenti- eth century, Kolmogorov’s theory of tur- bulence was another turning point, as it set future directions in the exploration of fluids. More complex geophysical models incorporating temperature, salinity, and ro- tation appeared subsequently, and they play a role in weather prediction and climate modeling. Nowadays, the field of mathematical fluid dynamics is one of the key areas of partial differential equations and has been the fo- cus of extensive research over the years. -
The Mathematics of Andrei Suslin
B U L L E T I N ( N e w Series) O F T H E A M E R I C A N MATHEMATICAL SOCIETY Vo lume 57, N u mb e r 1, J a n u a r y 2020, P a g e s 1–22 https://doi.org/10.1090/bull/1680 Art icle electronically publis hed o n S e p t e mbe r 24, 2019 THE MATHEMATICS OF ANDREI SUSLIN ERIC M. FRIEDLANDER AND ALEXANDER S. MERKURJEV C o n t e n t s 1. Introduction 1 2. Projective modules 2 3. K 2 of fields and the Brauer group 3 4. Milnor K-theory versus algebraic K-theory 7 5. K-theory and cohomology theories 9 6. Motivic cohomology and K-theories 12 7. Modular representation theory 16 Acknowledgments 18 About the authors 18 References 18 0. Introduction Andrei Suslin (1950–2018) was both friend and mentor to us. This article dis- cusses some of his many mathematical achievements, focusing on the role he played in shaping aspects of algebra and algebraic geometry. We mention some of the many important results Andrei proved in his career, proceeding more or less chronolog- ically beginning with Serre’s Conjecture proved by Andrei in 1976 (and simul- taneously by Daniel Quillen). As the reader will quickly ascertain, this article does not do justice to the many mathematicians who contributed to algebraic K- theory and related subjects in recent decades. In particular, work of Hyman Bass, Alexander Be˘ılinson, Spencer Bloch, Alexander Grothendieck, Daniel Quillen, Jean- Pierre Serre, and Christophe Soul`e strongly influenced Andrei’s mathematics and the mathematical developments we discuss. -
On Motivic Spherical Bundles
ON MOTIVIC SPHERICAL BUNDLES FLORIAN STRUNK Dissertation zur Erlangung des Doktorgrades (Dr. rer. nat.) des Fachbereichs Mathematik/Informatik an der Universit¨atOsnabr¨uck vorgelegt von Florian Strunk aus Lemgo Institut f¨urMathematik Universit¨atOsnabr¨uck Dezember 2012 Contents Introduction 1 1. Unstable motivic homotopy theory 3 1.1. The unstable motivic homotopy category . 5 1.2. Homotopy sheaves and fiber sequences . 15 1.3. Mather's cube theorem and some implications . 24 2. Stable motivic homotopy theory 31 2.1. The stable motivic homotopy category . 31 2.2. A consequence of the motivic Hurewicz theorem . 34 2.3. Motivic connectivity of morphisms . 39 3. The motivic J-homomorphism 44 3.1. Principal bundles and fiber bundles . 44 3.2. Fiber sequences from bundles . 52 3.3. Definition of a motivic J-homomorphism . 53 4. Vanishing results for the J-homomorphism 61 4.1. A relation with Thom classes . 61 4.2. Motivic Atiyah duality and the transfer . 65 4.3. A motivic version of Brown's trick . 67 4.4. Dualizability of GLn=NT ........................71 A. Appendix 74 A.1. Preliminaries on model categories . 74 A.2. Monoidal model categories . 80 A.3. Simplicial model categories . 82 A.4. Pointed model categories . 86 A.5. Stable model categories . 89 A.6. Fiber and cofiber sequences . 93 References . 96 ON MOTIVIC SPHERICAL BUNDLES 1 Introduction This thesis deals with a motivic version of the J-homomorphism from algebraic topology. The classical J-homomorphism was introduced under a different name in 1942 by Whitehead [Whi42] in order to study homotopy groups of the spheres.