MMPE'18 Do Druku
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Geometric Integration Theory Contents
Steven G. Krantz Harold R. Parks Geometric Integration Theory Contents Preface v 1 Basics 1 1.1 Smooth Functions . 1 1.2Measures.............................. 6 1.2.1 Lebesgue Measure . 11 1.3Integration............................. 14 1.3.1 Measurable Functions . 14 1.3.2 The Integral . 17 1.3.3 Lebesgue Spaces . 23 1.3.4 Product Measures and the Fubini–Tonelli Theorem . 25 1.4 The Exterior Algebra . 27 1.5 The Hausdorff Distance and Steiner Symmetrization . 30 1.6 Borel and Suslin Sets . 41 2 Carath´eodory’s Construction and Lower-Dimensional Mea- sures 53 2.1 The Basic Definition . 53 2.1.1 Hausdorff Measure and Spherical Measure . 55 2.1.2 A Measure Based on Parallelepipeds . 57 2.1.3 Projections and Convexity . 57 2.1.4 Other Geometric Measures . 59 2.1.5 Summary . 61 2.2 The Densities of a Measure . 64 2.3 A One-Dimensional Example . 66 2.4 Carath´eodory’s Construction and Mappings . 67 2.5 The Concept of Hausdorff Dimension . 70 2.6 Some Cantor Set Examples . 73 i ii CONTENTS 2.6.1 Basic Examples . 73 2.6.2 Some Generalized Cantor Sets . 76 2.6.3 Cantor Sets in Higher Dimensions . 78 3 Invariant Measures and the Construction of Haar Measure 81 3.1 The Fundamental Theorem . 82 3.2 Haar Measure for the Orthogonal Group and the Grassmanian 90 3.2.1 Remarks on the Manifold Structure of G(N,M).... 94 4 Covering Theorems and the Differentiation of Integrals 97 4.1 Wiener’s Covering Lemma and its Variants . -
Introduction
Notes Introduction 1 Marie Corelli, or Mary Mackay (1855–1924) was a successful romantic novelist. The quotation is from her pamphlet, Woman or – Suffragette? A Question of National Choice (London: C. Arthur Pearson, 1907). 2 Sally Ledger and Roger Luckhurst, eds, The Fin de Siècle: A Reader in Cultural History c.1880–1900 (Oxford: Oxford University Press, 2000), p. xii. 3 A central text is Steven Shapin and Simon Schaffer, Leviathan and the Air- pump: Hobbes, Boyle and the Experimental Life (Princeton: Princeton University Press, 1985). 4 Otto Mayr, ‘The science-technology relationship’, in Science in Context: Readings in the Sociology of Science, ed. by Barry Barnes and David Edge (Milton Keynes: Open University Press, 1982), pp. 155–163. 5 Nature, November 8 1900, News, p. 28. 6 For example Alison Winter, ‘A calculus of suffering: Ada Lovelace and the bodily constraints on women’s knowledge in early Victorian England’, in Science Incarnate: Historical Embodiments of Natural Knowledge, ed. by Christopher Lawrence and Steven Shapin (Chicago: University of Chicago Press, 1998), pp. 202–239 and Margaret Wertheim, Pythagoras’ Trousers: God, Physics and the Gender Wars (London: Fourth Estate, 1997). 7 Carl B. Boyer, A History of Mathematics (New York: Wiley, 1968), pp. 649–650. 8 For the social construction of mathematics see David Bloor, ‘Formal and informal thought’, in Science in Context: Readings in the Sociology of Science, ed. by Barry Barnes and David Edge (Milton Keynes: Open University Press, 1982), pp. 117–124; Math Worlds: Philosophical and Social Studies of Mathematics and Mathematics Education, ed. by Sal Restivo, Jean Paul Bendegem and Roland Fisher (Albany: State University of New York Press, 1993). -
Lecture Notes of the Unione Matematica Italiana
Lecture Notes of 3 the Unione Matematica Italiana Editorial Board Franco Brezzi (Editor in Chief) Persi Diaconis Dipartimento di Matematica Department of Statistics Università di Pavia Stanford University Via Ferrata 1 Stanford, CA 94305-4065, USA 27100 Pavia, Italy e-mail: [email protected], e-mail: [email protected] [email protected] John M. Ball Nicola Fusco Mathematical Institute Dipartimento di Matematica e Applicazioni 24-29 St Giles’ Università di Napoli “Federico II”, via Cintia Oxford OX1 3LB Complesso Universitario di Monte S. Angelo United Kingdom 80126 Napoli, Italy e-mail: [email protected] e-mail: [email protected] Alberto Bressan Carlos E. Kenig Department of Mathematics Department of Mathematics Penn State University University of Chicago University Park 1118 E 58th Street, University Avenue State College Chicago PA. 16802, USA IL 60637, USA e-mail: [email protected] e-mail: [email protected] Fabrizio Catanese Fulvio Ricci Mathematisches Institut Scuola Normale Superiore di Pisa Universitätstraße 30 Piazza dei Cavalieri 7 95447 Bayreuth, Germany 56126 Pisa, Italy e-mail: [email protected] e-mail: [email protected] Carlo Cercignani Gerard Van der Geer Dipartimento di Matematica Korteweg-de Vries Instituut Politecnico di Milano Universiteit van Amsterdam Piazza Leonardo da Vinci 32 Plantage Muidergracht 24 20133 Milano, Italy 1018 TV Amsterdam, The Netherlands e-mail: [email protected] e-mail: [email protected] Corrado De Concini Cédric Villani Dipartimento di Matematica Ecole Normale Supérieure de Lyon Università di Roma “La Sapienza” 46, allée d’Italie Piazzale Aldo Moro 2 69364 Lyon Cedex 07 00133 Roma, Italy France e-mail: [email protected] e-mail: [email protected] The Editorial Policy can be found at the back of the volume. -
Geometric Measure Theory at Brown in the 1960S
Geometric Measure Theory at Brown in the 1960s Wendell H. Fleming Brown University May 5, 2015 Table of Contents Part I. - Mathematical Results 1. Introduction. 3 2. Pre-1960 background. 5 i. Structure of sets of finite Hausdorff measure. 5 ii. Gauss-Green (divergence) theorem. .6 iii. The Plateau (least area) problem. 6 iv. Surface area theory. 8 v. de Rham’s currents. .9 vi. Young’s generalized surfaces . .11 vii. Whitney’s geometric integration theory. 12 3. Rectifiable and integral currents. 13 4. Normal currents, other results. 18 5. Flat chains. 19 6. Higher dimensional Plateau problem. 20 7. Regularity results, Bernstein’s Theorem. 22 1 8. Geometric variational problems, generalized surfaces, varifolds. 26 Part II - Remembrances 9. Brown University Mathematics Department in the 1960s. 29 10. Graduate students and visitors in GMT. 30 11. Remembrances of leaders in GMT (Almgren, De Giorgi, Federer, Reifenberg, Young). ..................................................................................32 Appendices A. Notations and definitions. .45 B. Abstracts. 49 C. Generalized surfaces. .50 References Scientific obituary articles. 64 Books. ...........................................................................64 Journal references. 66 2 Part I - Mathematical Results 1 Introduction. The field of geometric measure theory (GMT) is at an interface of problems in mathematical analysis and geometry. This article is intended as a historical retrospective, with emphasis on the decade 1960-1969. This was a time of rapid development of GMT, and Brown University was at the forefront. It is a revision and extension of material presented at a miniconference on April 16, 2011 in memory of Herbert Federer, who died in April 2010. Federer joined the Mathematics Department in 1945, and remained at Brown throughout his career. -
Lower Semicontinuity and Young Measures for Integral Functionals with Linear Growth
Lower Semicontinuity and Young Measures for Integral Functionals with Linear Growth Johan Filip Rindler Worcester College University of Oxford A thesis submitted for the degree of Doctor of Philosophy in Mathematics Trinity Term 2011 In memory of Rudolf Lange (b15 August 1931 d18 January 1994) and Jorg¨ Kraftmeier (b4 August 1942 d12 June 2005). Abstract The first contribution of this thesis is a new proof of sequential weak* lower semicontinuity m in BV(Ω; R ) for integral functionals of the form Z Z s 1 dD u s F(u) := f(x; ru) dx + f x; s djD uj Ω Ω djD uj Z 1 d−1 m + f x; uj@Ω ⊗ nΩ dH ; u 2 BV(Ω; R ); @Ω m×d where f : Ω × R ! R is a quasiconvex Carath´eodory integrand with linear growth at infinity, i.e. jf(x; A)j ≤ M(1+jAj) for some M > 0, and f is such that the recession function 1 −1 0 f (x; A) := limx0!x;t!1 t f(x ; tA) exists and is (jointly) continuous. In contrast to the classical proofs by Ambrosio & Dal Maso [J. Funct. Anal. 109 (1992), 76{97] and Fonseca & M¨uller[Arch. Ration. Mech. Anal. 123 (1993), 1{49], the one presented here does not use Alberti's Rank One Theorem [Proc. Roy. Soc. Edinburgh Sect. A 123 (1993), 239{274], but combines the usual blow-up method with a rigidity result for gradients. The second main result is the first general weak* lower semicontinuity theorem in the space BD(Ω) of functions of bounded deformation for functionals of the form Z Z s 1 dE u s F(u) := f(x; Eu) dx + f x; s djE uj Ω Ω djE uj Z 1 d−1 + f x; uj@Ω nΩ dH ; u 2 BD(Ω); @Ω where f satisfies similar assumptions as before, in particular it is assumed symmetric- quasiconvex.