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L'Enseignement Mathématique

L'Enseignement Mathématique Band 42 (1996)
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Heft 1-2: L'ENSEIGNEMENT MATHÉMATIQUE
Titelseiten
Titelseiten
Inhaltsverzeichnis 1
Titelseiten 2
Artikel: LA CONJECTURE abc 3
Kapitel: 1. Introduction 3
Kapitel: 2. La conjecture abc 4
Kapitel: 3. Applications de la conjecture abc 6
Kapitel: 4. A LA RECHERCHE DE FORMES EFFECTIVES 15
Kapitel: 5. GÉNÉRALISATIONS 20
Bibliographie 22
Artikel: DOUBLE VALUED REFLECTION IN THE COMPLEX PLANE 25
Kapitel: Introduction 25
Kapitel: 1. Double valued reflection 26
Kapitel: 2. Conic sections 29
Kapitel: 3. The intrinsic theory: genus zero 33
Kapitel: 4. Riemann maps 36
Kapitel: 5. INVOLUTIONS ON A TORUS 40
Kapitel: 6. Embedding of tori 43
Kapitel: 7. A RECTANGULAR LATTICE 46
Bibliographie 48
Artikel: KLYACHKO'S METHODS AND THE SOLUTION OF EQUATIONS OVER TORSION-FREE GROUPS 49
Kurzfassung 49
Kapitel: 1. Introduction 50
Kapitel: 2. The crash theorems 52
Kapitel: 3. TWO TRANSVERSALITY LEMMAS 57
Kapitel: 4. Application to the Kervaire problem 61
Kapitel: 5. The general case 67
Kapitel: 6. Further Applications 71
Bibliographie 73
Artikel: CENTRALISERS IN THE BRAID GROUP AND SINGULAR BRAID MONOID 75
Kurzfassung 75
Kapitel: 1. Introduction and Basic Definitions 75
Kapitel: 2. Commutation and stabilisers 80
Kapitel: 3. Proof of Theorem 2.2 82
Kapitel: 4. Centralisers of braid subgroups 84
Kapitel: 5. The singular braid monoid and the map η 87
Kapitel: 6. Results regarding injectivity of η 89
Kapitel: 7. Centralisers in $SB_n$ 94
Bibliographie 95
Artikel: MOYENNES SUR CERTAINS ENSEMBLES DE DIVISEURS D'UN ENTIER 97
Kurzfassung 97
Kapitel: 1. Introduction 97
Kapitel: 2. Propriétés arithmétiques de $\bar{f}$, $\hat{f}$ et $\tilde{f}$ 100
Kapitel: 3. Valeurs moyennes de $\bar{f}$, $\hat{f}$ et $\tilde{f}$ 106
Kapitel: 4. Mesure de l'écart entre f et les moyennes $\bar{f}$, $\hat{f}$ et $\tilde{f}$ 113
Kapitel: 5. GÉNÉRALISATIONS ET EXEMPLES 115
Bibliographie 122
Artikel: EMPILEMENTS DE CERCLES ET REPRÉSENTATIONS CONFORMES: une nouvelle preuve du théorème de Rodin-Sullivan 125
Kapitel: I. Introduction 125
Kapitel: II. Le Théorème de Rodin-Sullivan : ÉNONCÉ ET SCHÉMA DE LA PREUVE 126
Kapitel: IV. Estimations à priori des rayons 135
Kapitel: V. Changement de variable 139
Kapitel: VI. Inégalité de Harnack 142
Kapitel: VII. Commentaires 149
Kapitel: 1. Sur l'inégalité de Harnack 149
Kapitel: 2. Sur le théorème de Rodin-Sullivan 150
Bibliographie 151
Artikel: UNIFORM DISTRIBUTION ON DIVISORS AND BEHREND SEQUENCES 153
Kapitel: 1. DEFINITIONS AND BASIC RESULTS 153
Kapitel: 2. Functions of moderate growth 164
Kapitel: 3. Functions of excessive growth: the case $f(d) = d^\alpha$ 174
Kapitel: 4. FUNCTIONS OF EXCESSIVE GROWTH : THE CASE f(d) =θd 180
Kapitel: §5. Additive functions 190
Kapitel: 6. Metric results 193
Bibliographie 196
Rubrik: BULLETIN BIBLIOGRAPHIQUE 1
Endseiten
Endseiten
Heft 3-4: L'ENSEIGNEMENT MATHÉMATIQUE
Titelseiten
Artikel: ON THE GAUSS-BONNET FORMULA FOR LOCALLY SYMMETRIC SPACES OF NONCOMPACT TYPE 201
Kurzfassung 201
Kapitel: Introduction 201
Kapitel: 1. The formula of Allendoerfer and Weil 203
Kapitel: 2. An exhaustion of locally symmetric spaces 204
Kapitel: 2.1. Reduction theory and geometry at infinity 204
Kapitel: 2.2. An exhaustion by polyhedra 207
Kapitel: 3. ESTIMATES FOR THE BOUNDARY SUBPOLYHEDRA 209
Kapitel: 4. A NEW PROOF OF THE GAUSS-BONNET FORMULA 212
Bibliographie 213
Artikel: INTRODUCTORY NOTES ON RICHARD THOMPSON'S GROUPS 215
Kapitel: §1. Introduction to F 216
Kapitel: §2. Tree diagrams 218
Kapitel: §3. Presentations for F 225
Kapitel: §4. Further properties of F 227
Kapitel: §5. Thompson's group T 233
Kapitel: §6. Thompson's group V 240
Kapitel: §7. Piecewise integral projective structures 248
Bibliographie 254
Artikel: SQUARE-FREE TOWER OF HANOI SEQUENCES 257
Kurzfassung 257
Kapitel: 0. Square-free strings and the Olive sequence 257
Kapitel: 1. A FINITE ALPHABET 260
Kapitel: 2. Smaller alphabets 262
Bibliographie 263
Artikel: CHARACTERISTIC CLASSES, ELLIPTIC OPERATORS AND COMPACT GROUP ACTIONS 265
Kapitel: 0. Introduction 265
Kapitel: 1. CHARACTERISTIC CLASSES AND MULTIPLICATIVE SEQUENCES 266
Kapitel: 2. The index of an elliptic complex 271
Kapitel: 3. The Lefschetz fixed point formula 277
Kapitel: 4. The Lefschetz Theorem for foliated manifolds 282
Kapitel: 5. Group Actions and the Lefschetz Theorem 287
Kapitel: 6. The Rigidity Theorem of Witten 290
Bibliographie 292
Artikel: BARBIER'S THEOREM FOR THE SPHERE AND THE HYPERBOLIC PLANE 295
Kapitel: 1. Introduction 295
Kapitel: 2. Curves of constant width in the euclidean plane 297
Kapitel: 3. Geodesic parallel coordinates 302
Kapitel: 4. Proof of the main results 307
Bibliographie 308
Artikel: SYSTEMS OF CURVES ON A CLOSED ORIENTABLE SURFACE 311
Kapitel: 1. Introduction 311
Kapitel: 2. Necessary conditions 315
Kapitel: 3. SUFFICIENCY FOR A SINGLE HOMOLOGY CLASS 317
Kapitel: 4. SUFFICIENCY FOR INDEPENDENT HOMOLOGY CLASSES 319
Kapitel: 5. Disjoint simple closed curves on a planar surface 320
Kapitel: 6. SUFFICIENCY IN THEOREM 3 324
Kapitel: 7. Various instructive examples 332
Kapitel: 8. Some Final Observations 335
Bibliographie 339
Artikel: THE ZERO-IN-THE-SPECTRUM QUESTION 341
Kurzfassung 341
Kapitel: 1. Introduction 341
Chapter: 2. DEFINITION OF $L^2$ -COHOMOLOGY 343
Chapter: 3. General Properties of $L^2$-Cohomology 351
Chapter: 4. Very Low Dimensions 358
Chapter: 4.1 One Dimension 358
Chapter: 4.2 Two Dimensions 361
Chapter: 5. Universal Covers 362
Chapter: 5.1 Big and Small Groups 363
Chapter: 5.2 Two and Three Dimensions 365
Chapter: 5.3 Four Dimensions 367
Chapter: 5.4 More Dimensions 369
Chapter: 6. Topologically Tame Manifolds 372
Bibliography 375
Article: IN DEFENSE OF EULER 377
Bibliography 382
Article: FACTOR EQUIVALENCE RESULTS FOR INTEGERS AND UNITS 383
Abstract 383
Chapter: 1. Introduction 383
Chapter: 2. Factorizability and factor equivalence 384
Chapter: 3. Rings of integers 386
Chapter: 4. S-UNITS 387
Chapter: 5. Applications 391
Bibliography 393
Rubric: COMMISSION INTERNATIONALE DE L'ENSEIGNEMENT MATHÉMATIQUE (THE INTERNATIONAL COMMISSION ON MATHEMATICAL INSTRUCTION) 395
Article: UNDERSTANDING THE PROCESSES OF ADVANCED MATHEMATICAL THINKING 395
Chapter: Introduction 395
Chapter: THE DEVELOPMENT OF MATHEMATICAL THINKING 395
Chapter: compression of knowledge in mathematics 398
Chapter: VISUALISING MATHEMATICAL CONCEPTS 400
Chapter: USING SYMBOLISM TO COMPRESS PROCESS INTO CONCEPT 404
Chapter: SEQUENTIAL AND PROCEDURAL COMPRESSION 406
Chapter: transition to formal mathematics 407
Chapter: Can we teach students to "think mathematically" ? 410
Chapter: Reflections on mathematical thinking 412
Bibliography 413
Rubric: BULLETIN BIBLIOGRAPHIQUE 27
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