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Northeastern Section Newsletter Fall 2007
1 NORTHEASTERN SECTION NEWSLETTER FALL 2007 Volume 29 Number 2 Web Page: http:/www.maa.org/northeastern Webmaster: Tommy Ratliff, Wheaton College 2 EXECUTIVE COMMITTEE CHAIR: GOVERNOR Tommy Ratliff Ockle Johnson Department of Mathematics Department of Mathematics and Computer Science Keene State College Wheaton College Keene, NH 03435-2001 Norton, MA 02766 (603)358-2585 (508)286-3968 [email protected] [email protected] PAST CHAIR CHAIR-ELECT Sarah L. Mabrouk Jason J. Moliterno Department of Mathematics Department of Mathematics Framingham State College Academic Building SC 207 100 State Street, PO Box 9101 Sacred Heart University Framingham, MA 01701-9101 5151 Park Avenue (508)626-4785 Fairfield, CT 06825 [email protected] (203)396-8324 [email protected] SECRETARY-TREASURER TWO-YEAR COLLEGE REP. Ann Kizanis Lois Martin Mathmatics Department Mathematics Department Western New England College Massasoit Community CollegeSpringfield, MA 01119 Brockton, MA 02302 (413)782-1784 (508)588-9100, x 1621 [email protected] [email protected] NEWSLETTER EDITOR Frank Ford Department of Mathematics/CS Providence College Providence, RI 02918 (401)865-2635 [email protected] 2 NEXT SECTION MEETING November 16 and 17, 2007 Fall Section Meeting Framingham State College, Framingham, MA Program Chair: Sarah Mabrouk, Framingham State College Local Chair: Sarah Mabrouk, Framingham State College FUTURE SECTION MEETINGS May 30 and 31, 2008 Spring Section Meeting St. Michael’s College, Colchester, VT Fall 2008 Bentley College, Waltham, -
LA/MS MAA Newsletter
Mathematical Association of America Newsletter Winter 2001/2002 Volume 24, No. 2 Executive Committee 2001-2002 Chair: Frank Serio, Northwestern State University of Louisiana [email protected] (318) 357-4308 Mississippi Vice Chair/Internet Coordinator: John Travis, Mississippi College [email protected] (601) 925-3817 Louisiana Vice Chair: Judith Covington, Louisiana State University- Shreveport [email protected] 318-797-5354 Secretary/Treasurer: Leigh Ann Myers, Northwestern State University of Louisiana [email protected] (318) 357-4308 Newsletter Editor: Bonnie Oppenheimer, Mississippi University for Women [email protected] (662) 329-7239 Immediate Past Chair: Gerard Buskes, University of Mississippi [email protected] (662) 915-7425 Section Governor: Connie Campbell, Millsaps, [email protected] (601) 974-1371 Section Info on the Web http://www.mc.edu/campus/users/travis/maa/ Past newsletter as well as an electronic version of this one: http://www.mc.edu/campus/users/travis/maa/newsletters/index.html SPRING 2002 MEETING INFORMATION 1 of 11 Dates for the Spring 2002 LA-MS Section meeting are March1-2, 2002.Northwestern State University of Louisiana, under the direction of Section Chair Frank Serio, will be the hosting institution.A registration form, Call for Papers, and Hotel Information for the meeting in Natchitoches, Louisiana, is available on our section web site: http://www.mc.edu/campus/users/travis/maa/.A registration form and tentative schedule are included in this printed version of the newsletter. Section Chair’s Report Frank Serio It has been an honor to serve as your Chair for the past year. Planning the spring sectional meeting has been a rewarding task. -
The Singular Structure and Regularity of Stationary Varifolds 3
THE SINGULAR STRUCTURE AND REGULARITY OF STATIONARY VARIFOLDS AARON NABER AND DANIELE VALTORTA ABSTRACT. If one considers an integral varifold Im M with bounded mean curvature, and if S k(I) x ⊆ ≡ { ∈ M : no tangent cone at x is k + 1-symmetric is the standard stratification of the singular set, then it is well } known that dim S k k. In complete generality nothing else is known about the singular sets S k(I). In this ≤ paper we prove for a general integral varifold with bounded mean curvature, in particular a stationary varifold, that every stratum S k(I) is k-rectifiable. In fact, we prove for k-a.e. point x S k that there exists a unique ∈ k-plane Vk such that every tangent cone at x is of the form V C for some cone C. n 1 n × In the case of minimizing hypersurfaces I − M we can go further. Indeed, we can show that the singular ⊆ set S (I), which is known to satisfy dim S (I) n 8, is in fact n 8 rectifiable with uniformly finite n 8 measure. ≤ − − − 7 An effective version of this allows us to prove that the second fundamental form A has apriori estimates in Lweak on I, an estimate which is sharp as A is not in L7 for the Simons cone. In fact, we prove the much stronger | | 7 estimate that the regularity scale rI has Lweak-estimates. The above results are in fact just applications of a new class of estimates we prove on the quantitative k k k k + stratifications S ǫ,r and S ǫ S ǫ,0. -
Geometric Measure Theory and Differential Inclusions
GEOMETRIC MEASURE THEORY AND DIFFERENTIAL INCLUSIONS C. DE LELLIS, G. DE PHILIPPIS, B. KIRCHHEIM, AND R. TIONE Abstract. In this paper we consider Lipschitz graphs of functions which are stationary points of strictly polyconvex energies. Such graphs can be thought as integral currents, resp. varifolds, which are stationary for some elliptic integrands. The regularity theory for the latter is a widely open problem, in particular no counterpart of the classical Allard’s theorem is known. We address the issue from the point of view of differential inclusions and we show that the relevant ones do not contain the class of laminates which are used in [22] and [25] to construct nonregular solutions. Our result is thus an indication that an Allard’s type result might be valid for general elliptic integrands. We conclude the paper by listing a series of open questions concerning the regularity of stationary points for elliptic integrands. 1. Introduction m 1 n×m Let Ω ⊂ R be open and f 2 C (R ; R) be a (strictly) polyconvex function, i.e. such that there is a (strictly) convex g 2 C1 such that f(X) = g(Φ(X)), where Φ(X) denotes the vector of n subdeterminants of X of all orders. We then consider the following energy E : Lip(Ω; R ) ! R: E(u) := f(Du)dx : (1) ˆΩ n Definition 1.1. Consider a map u¯ 2 Lip(Ω; R ). The one-parameter family of functions u¯ + "v will be called outer variations and u¯ will be called critical for E if d E 1 n (¯u + "v) = 0 8v 2 Cc (Ω; R ) : d" "=0 1 m 1 Given a vector field Φ 2 Cc (Ω; R ) we let X" be its flow . -
Princeton University Press Spring 2019 Catalog
Mathematics 2019 press.princeton.edu NEW & FORTHCOMING “We o en claim that education should not just teach facts; it should help us learn how to think clearly. [ is] is a book that takes that goal seriously. It is brilliantly constructed, clearly written, and fun.” —William C. Powers Jr., former president of the University of Texas, Austin Making Up Your Own Mind We solve countless problems—big and small—every day. With so much practice, why do we o en have trouble making simple decisions—much less arriving at optimal solutions to important questions? Is there a practical way to learn to think more e ectively and creatively? Edward Burger shows how we can become far better at solving real-world problems by learning creative puzzle-solving skills using simple, e ective thinking techniques. EDWARD B. BURGER is the president of Southwestern University, a mathematics professor, and a leading teacher on thinking, innovation, and creativity. He 2018. 136 pages. 35 b/w illus. 4 ½ x 7 ½ . has written more than seventy research articles, video Hardback 9780691182780 $19.95 | £14.99 series, and books, including e 5 Elements of E ective E-book 9780691188881 Audiobook 9780691193014 inking (with Michael Starbird) (Princeton). “Much of today’s college talk revolves around getting in—but this book meaningfully shi s the focus to how to be successful once getting to college. Johnson provides expert advice to make this book an important and eye-opening read.” —Sarah Graham, director of college counseling, Princeton Day School Will This Be on the Test? is is the essential survival guide for high-school students making the transition to college academics. -
Weatherhead Center for International Affairs
WEATHERHEAD CENTER FOR INTERNATIONAL AFFAIRS H A R V A R D U N I V E R S I T Y two2004-2005 thousand four – two thousand five ANNUAL REPORTS two2005-2006 thousand five – two thousand six 1737 Cambridge Street • Cambridge, MA 02138 www.wcfia.harvard.edu TABLE OF CONTENTS INTRODUCTION 2 PEOPLE Visiting Committee 4 Executive Committee 4 Administration 6 RESEARCH ACTIVITIES Small Grants for Faculty Research Projects 8 Medium Grants for Faculty Research Projects 9 Large Grants for Faculty Research Projects 9 Large Grants for Faculty Research Semester Leaves 9 Distinguished Lecture Series 11 Weatherhead Initiative in International Affairs 12 CONFERENCES 13 RESEARCH SEMINARS Challenges of the Twenty-First Century 34 Communist and Postcommunist Countries 35 Comparative Politics Research Workshop 36 Comparative Politics Seminar 39 Director’s Faculty Seminar 39 Economic Growth and Development 40 Harvard-MIT Joint Seminar on Political Development 41 Herbert C. Kelman Seminar on International Conflict Analysis and Resolution 42 International Business 43 International Economics 45 International History 48 Middle East 49 Political Violence and Civil War 51 Science and Society 51 South Asia 52 Transatlantic Relations 53 U.S. Foreign Policy 54 RESEARCH PROGRAMS Canada Program 56 Fellows Program 58 Harvard Academy for International and Area Studies 65 John M. Olin Institute for Strategic Studies 74 Justice, Welfare, and Economics 80 Nonviolent Sanctions and Cultural Survival 82 Religion, Political Economy, and Society 84 Student Programs 85 Transnational Studies Initiative 95 U.S.-Japan Relations 96 PUBLICATIONS 104 ANNUAL REPORTS 2004–2005 / 2005–2006 - 1 - INTRODUCTION In August 2005, the Weatherhead Center moved In another first, the faculty research semester to the new Center for Government and leaves that the Center awarded in spring 2005 International Studies (CGIS) complex. -
GMT – Varifolds Cheat-Sheet Sławomir Kolasiński Some Notation
GMT – Varifolds Cheat-sheet Sławomir Kolasiński Some notation [id & cf] The identity map on X and the characteristic function of some E ⊆ X shall be denoted by idX and 1E : [Df & grad f] Let X, Y be Banach spaces and U ⊆ X be open. For the space of k times continuously k differentiable functions f ∶ U → Y we write C (U; Y ). The differential of f at x ∈ U is denoted Df(x) ∈ Hom(X; Y ) : In case Y = R and X is a Hilbert space, we also define the gradient of f at x ∈ U by ∗ grad f(x) = Df(x) 1 ∈ X: [Fed69, 2.10.9] Let f ∶ X → Y . For y ∈ Y we define the multiplicity −1 N(f; y) = cardinality(f {y}) : [Fed69, 4.2.8] Whenever X is a vectorspace and r ∈ R we define the homothety µr(x) = rx for x ∈ X: [Fed69, 2.7.16] Whenever X is a vectorspace and a ∈ X we define the translation τ a(x) = x + a for x ∈ X: [Fed69, 2.5.13,14] Let X be a locally compact Hausdorff space. The space of all continuous real valued functions on X with compact support equipped with the supremum norm is denoted K (X) : [Fed69, 4.1.1] Let X, Y be Banach spaces, dim X < ∞, and U ⊆ X be open. The space of all smooth (infinitely differentiable) functions f ∶ U → Y is denoted E (U; Y ) : The space of all smooth functions f ∶ U → Y with compact support is denoted D(U; Y ) : It is endowed with a locally convex topology as described in [Men16, Definition 2.13]. -
GMT Seminar: Introduction to Integral Varifolds
GMT Seminar: Introduction to Integral Varifolds DANIEL WESER These notes are from two talks given in a GMT reading seminar at UT Austin on February 27th and March 6th, 2019. 1 Introduction and preliminary results Definition 1.1. [Sim84] n k Let G(n; k) be the set of k-dimensional linear subspaces of R . Let M be locally H -rectifiable, n 1 and let θ : R ! N be in Lloc. Then, an integral varifold V of dimension k in U is a Radon 0 measure on U × G(n; k) acting on functions ' 2 Cc (U × G(n; k) by Z k V (') = '(x; TxM) θ(x) dH : M By \projecting" U × G(n; k) onto the first factor, we arrive at the following definition: Definition 1.2. [Lel12] n Let U ⊂ R be an open set. An integral varifold V of dimension k in U is a pair V = (Γ; f), k 1 where (1) Γ ⊂ U is a H -rectifiable set, and (2) f :Γ ! N n f0g is an Lloc Borel function (called the multiplicity function of V ). We can naturally associate to V the following Radon measure: Z k µV (A) = f dH for any Borel set A: Γ\A We define the mass of V to be M(V ) := µV (U). We define the tangent space TxV to be the approximate tangent space of the measure µV , k whenever this exists. Thus, TxV = TxΓ H -a.e. Definition 1.3. [Lel12] If Φ : U ! W is a diffeomorphism and V = (Γ; f) an integral varifold in U, then the pushfor- −1 ward of V is Φ#V = (Φ(Γ); f ◦ Φ ); which is itself an integral varifold in W . -
HOMECOMING 2010 We Are Also Excited to Have Dr
FALL 2010 NEWSLETTER A Message from the Chair Greetings, math alums, from the Department of Mathematics! Since our last newsletter was released in January 2010, there have been significant changes at Baylor. Judge Kenneth Winston Starr has been inaugurated as Baylor University’s 14th President and Dr. Elizabeth Davis was named Executive Vice President and Provost. All of us at Baylor are thrilled with these two appointments and, through the stability that these appointments bring, we are confident that Baylor will continue its push onwards and upwards to becoming one of the nation’s elite universities. On the departmental level, we have seen several important changes in the past few months. We’ve added Dr. Matthew Beauregard (University of Arizona), Gail Brooks (Baylor University, McLennan Community College), and Dr. Jonatan Lenells (University of Lund, Sweden) to our staff this fall and we are very pleased to welcome each of them into our mathematical family. HOMECOMING 2010 We are also excited to have Dr. Edward B. Burger, the 2010 Robert Foster Cherry Award winner for Great Teaching, with Homecoming this year is Saturday us this semester. Ed is the Lissack Professor for Social Responsibility and Personal Ethics at Williams College (MA) October 23. The Department of and is a multi-honored teacher of mathematics and an Mathematics will host a breakfast award-winning author of textbooks and videos. Besides from 9:30-11:30 that morning on the teaching two courses for us, Ed is heavily involved with first floor of Sid Rich. We would love several other projects across our campus. -
Intrinsic Geometry of Varifolds in Riemannian Manifolds: Monotonicity and Poincare-Sobolev Inequalities
Intrinsic Geometry of Varifolds in Riemannian Manifolds: Monotonicity and Poincare-Sobolev Inequalities Julio Cesar Correa Hoyos Tese apresentada ao Instituto de Matemática e Estatística da Universidade de São Paulo para obtenção do título de Doutor em Ciências Programa: Doutorado em Matemática Orientador: Prof. Dr. Stefano Nardulli Durante o desenvolvimento deste trabalho o autor recebeu auxílio financeiro da CAPES e CNPq São Paulo, Agosto de 2020 Intrinsic Geometry of Varifolds in Riemannian Manifolds: Monotonicity and Poincare-Sobolev Inequalities Esta é a versão original da tese elaborada pelo candidato Julio Cesar Correa Hoyos, tal como submetida à Comissão Julgadora. Resumo CORREA HOYOS, J.C. Geometría Intrínsica de Varifolds em Variedades Riemannianas: Monotonia e Desigualdades do Tipo Poincaré-Sobolev . 2010. 120 f. Tese (Doutorado) - Instituto de Matemática e Estatística, Universidade de São Paulo, São Paulo, 2020. São provadas desigualdades do tipo Poincaré e Sobolev para funções com suporte compacto definidas em uma varifold k-rectificavel V definida em uma variedade Riemanniana com raio de injetividade positivo e curvatura secional limitada por cima. As técnica usadas permitem consid- erar variedades Riemannianas (M n; g) com métrica g de classe C2 ou mais regular, evitando o uso do mergulho isométrico de Nash. Dito análise permite re-fazer algums fragmentos importantes da teoría geométrica da medida no caso das variedades Riemannianas com métrica C2, que não é Ck+α, com k + α > 2. A classe de varifolds consideradas, são aquelas em que sua primeira variação δV p esta em um espaço de Labesgue L com respeito à sua medida de massa kV k com expoente p 2 R satisfazendo p > k. -
EUROPEAN MATHEMATICAL SOCIETY EDITOR-IN-CHIEF ROBIN WILSON Department of Pure Mathematics the Open University Milton Keynes MK7 6AA, UK E-Mail: [email protected]
CONTENTS EDITORIAL TEAM EUROPEAN MATHEMATICAL SOCIETY EDITOR-IN-CHIEF ROBIN WILSON Department of Pure Mathematics The Open University Milton Keynes MK7 6AA, UK e-mail: [email protected] ASSOCIATE EDITORS VASILE BERINDE Department of Mathematics, University of Baia Mare, Romania e-mail: [email protected] NEWSLETTER No. 47 KRZYSZTOF CIESIELSKI Mathematics Institute March 2003 Jagiellonian University Reymonta 4 EMS Agenda ................................................................................................. 2 30-059 Kraków, Poland e-mail: [email protected] Editorial by Sir John Kingman .................................................................... 3 STEEN MARKVORSEN Department of Mathematics Executive Committee Meeting ....................................................................... 4 Technical University of Denmark Building 303 Introducing the Committee ............................................................................ 7 DK-2800 Kgs. Lyngby, Denmark e-mail: [email protected] An Answer to the Growth of Mathematical Knowledge? ............................... 9 SPECIALIST EDITORS Interview with Vagn Lundsgaard Hansen .................................................. 15 INTERVIEWS Steen Markvorsen [address as above] Interview with D V Anosov .......................................................................... 20 SOCIETIES Krzysztof Ciesielski [address as above] Israel Mathematical Union ......................................................................... 25 EDUCATION Tony Gardiner -
On Relations Between Adams Spectral Sequences, with an Application to the Stable Homotopy of a Moore Space
Journal of Pure and Applied Algebra 20 (1981) 287-312 0 North-Holland Publishing Company ON RELATIONS BETWEEN ADAMS SPECTRAL SEQUENCES, WITH AN APPLICATION TO THE STABLE HOMOTOPY OF A MOORE SPACE Haynes R. MILLER* Harvard University, Cambridge, MA 02130, UsA Communicated by J.F. Adams Received 24 May 1978 0. Introduction A ring-spectrum B determines an Adams spectral sequence Ez(X; B) = n,(X) abutting to the stable homotopy of X. It has long been recognized that a map A +B of ring-spectra gives rise to information about the differentials in this spectral sequence. The main purpose of this paper is to prove a systematic theorem in this direction, and give some applications. To fix ideas, let p be a prime number, and take B to be the modp Eilenberg- MacLane spectrum H and A to be the Brown-Peterson spectrum BP at p. For p odd, and X torsion-free (or for example X a Moore-space V= So Up e’), the classical Adams E2-term E2(X;H) may be trigraded; and as such it is E2 of a spectral sequence (which we call the May spectral sequence) converging to the Adams- Novikov Ez-term E2(X; BP). One may say that the classical Adams spectral sequence has been broken in half, with all the “BP-primary” differentials evaluated first. There is in fact a precise relationship between the May spectral sequence and the H-Adams spectral sequence. In a certain sense, the May differentials are the Adams differentials modulo higher BP-filtration. One may say the same for p=2, but in a more attenuated sense.