Abstracts of Papers Presented in Columbus, OH Abstracts of Papers Presented At
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Kissing Numbers: Surprises in Dimension Four Günter M
Kissing numbers: Surprises in Dimension Four Günter M. Ziegler, TU Berlin The “kissing number problem” is a basic geometric problem that got its name from billards: Two balls “kiss” if they touch. The kissing number problem asks how many other balls can touch one given ball at the same time. If you arrange the balls on a pool ta- ble, it is easy to see that the answer is exactly six: Six balls just perfectly surround a given ball. Graphic: Detlev Stalling, ZIB Berlin and at the same time Vladimir I. Levenstein˘ in Russia proved that the correct, exact maximal numbers for the kissing number prob- lem are 240 in dimension 8, and 196560 in dimension 24. This is amazing, because these are also the only two dimensions where one knows a precise answer. It depends on the fact that mathemati- cians know very remarkable configurations in dimensions 8 and 24, which they call the E8 lattice and the Leech lattice, respectively. If, however, you think about this as a three-dimensional problem, So the kissing number problem remained unsolved, in particular, the question “how many balls can touch a given ball at the same for the case of dimension four. The so-called 24-cell, a four- time” becomes much more interesting — and quite complicated. In dimensional “platonic solid” of remarkable beauty (next page), fact, The 17th century scientific genius Sir Isaac Newton and his yields a configuration of 24 balls that would touch a given one in colleague David Gregory had a controversy about this in 1694 — four-dimensional space. -
Is the Universe Expanding?: an Historical and Philosophical Perspective for Cosmologists Starting Anew
Western Michigan University ScholarWorks at WMU Master's Theses Graduate College 6-1996 Is the Universe Expanding?: An Historical and Philosophical Perspective for Cosmologists Starting Anew David A. Vlosak Follow this and additional works at: https://scholarworks.wmich.edu/masters_theses Part of the Cosmology, Relativity, and Gravity Commons Recommended Citation Vlosak, David A., "Is the Universe Expanding?: An Historical and Philosophical Perspective for Cosmologists Starting Anew" (1996). Master's Theses. 3474. https://scholarworks.wmich.edu/masters_theses/3474 This Masters Thesis-Open Access is brought to you for free and open access by the Graduate College at ScholarWorks at WMU. It has been accepted for inclusion in Master's Theses by an authorized administrator of ScholarWorks at WMU. For more information, please contact [email protected]. IS THEUN IVERSE EXPANDING?: AN HISTORICAL AND PHILOSOPHICAL PERSPECTIVE FOR COSMOLOGISTS STAR TING ANEW by David A Vlasak A Thesis Submitted to the Faculty of The Graduate College in partial fulfillment of the requirements forthe Degree of Master of Arts Department of Philosophy Western Michigan University Kalamazoo, Michigan June 1996 IS THE UNIVERSE EXPANDING?: AN HISTORICAL AND PHILOSOPHICAL PERSPECTIVE FOR COSMOLOGISTS STARTING ANEW David A Vlasak, M.A. Western Michigan University, 1996 This study addresses the problem of how scientists ought to go about resolving the current crisis in big bang cosmology. Although this problem can be addressed by scientists themselves at the level of their own practice, this study addresses it at the meta level by using the resources offered by philosophy of science. There are two ways to resolve the current crisis. -
Gazette Des Mathématiciens
JUILLET 2018 – No 157 la Gazette des Mathématiciens • Autour du Prix Fermat • Mathématiques – Processus ponctuels déterminantaux • Raconte-moi... le champ libre gaussien • Tribune libre – Quelle(s) application(s) pour le plan Torossian-Villani la GazetteComité de rédaction des Mathématiciens Rédacteur en chef Sébastien Gouëzel Boris Adamczewski Université de Nantes Institut Camille Jordan, Lyon [email protected] [email protected] Sophie Grivaux Rédacteurs Université de Lille [email protected] Thomas Alazard École Normale Supérieure de Paris-Saclay [email protected] Fanny Kassel IHÉS Maxime Bourrigan [email protected] Lycée Saint-Geneviève, Versailles [email protected] Pauline Lafitte Christophe Eckès École Centrale, Paris Archives Henri Poincaré, Nancy [email protected] [email protected] Damien Gayet Romain Tessera Institut Fourier, Grenoble Université Paris-Sud [email protected] [email protected] Secrétariat de rédaction : smf – Claire Ropartz Institut Henri Poincaré 11 rue Pierre et Marie Curie 75231 Paris cedex 05 Tél. : 01 44 27 67 96 – Fax : 01 40 46 90 96 [email protected] – http://smf.emath.fr Directeur de la publication : Stéphane Seuret issn : 0224-8999 À propos de la couverture. Cette image réalisée par Alejandro Rivera (Institut Fourier) est le graphe de la partie positive du champ libre gaussien sur le tore plat 2=(2á2) projeté sur la somme des espaces propres du laplacien de valeur propre plus petite que 500. Les textures et couleurs ajoutées sur le graphe sont pure- ment décoratives. La fonction a été calculée avec C++ comme une somme de polynômes trigonométriques avec des poids aléatoires bien choisis, le graphe a été réalisé sur Python et les textures et couleurs ont été réalisées avec gimp. -
Local Covering Optimality of Lattices: Leech Lattice Versus Root Lattice E8
Local Covering Optimality of Lattices: Leech Lattice versus Root Lattice E8 Achill Sch¨urmann, Frank Vallentin ∗ 10th November 2004 Abstract We show that the Leech lattice gives a sphere covering which is locally least dense among lattice coverings. We show that a similar result is false for the root lattice E8. For this we construct a less dense covering lattice whose Delone subdivision has a common refinement with the Delone subdivision of E8. The new lattice yields a sphere covering which is more than 12% less dense than the formerly ∗ best known given by the lattice A8. Currently, the Leech lattice is the first and only known example of a locally optimal lattice covering having a non-simplicial Delone subdivision. We hereby in particular answer a question of Dickson posed in 1968. By showing that the Leech lattice is rigid our answer is even strongest possible in a sense. 1 Introduction The Leech lattice is the exceptional lattice in dimension 24. Soon after its discovery by Leech [Lee67] it was conjectured that it is extremal for several geometric problems in R24: the kissing number problem, the sphere packing problem and the sphere covering problem. In 1979, Odlyzko and Sloane and independently Levenshtein solved the kissing number problem in dimension 24 by showing that the Leech lattice gives an optimal solution. Two years later, Bannai and Sloane showed that it gives the unique solution up to isometries (see [CS88], Ch. 13, 14). Unlike the kissing number problem, the other two problems are still open. Recently, Cohn and Kumar [CK04] showed that the Leech lattice gives the unique densest lattice sphere packing in R24. -
The Physical Tourist Physics and New York City
Phys. perspect. 5 (2003) 87–121 © Birkha¨user Verlag, Basel, 2003 1422–6944/05/010087–35 The Physical Tourist Physics and New York City Benjamin Bederson* I discuss the contributions of physicists who have lived and worked in New York City within the context of the high schools, colleges, universities, and other institutions with which they were and are associated. I close with a walking tour of major sites of interest in Manhattan. Key words: Thomas A. Edison; Nikola Tesla; Michael I. Pupin; Hall of Fame for GreatAmericans;AlbertEinstein;OttoStern;HenryGoldman;J.RobertOppenheimer; Richard P. Feynman; Julian Schwinger; Isidor I. Rabi; Bronx High School of Science; StuyvesantHighSchool;TownsendHarrisHighSchool;NewYorkAcademyofSciences; Andrei Sakharov; Fordham University; Victor F. Hess; Cooper Union; Peter Cooper; City University of New York; City College; Brooklyn College; Melba Phillips; Hunter College; Rosalyn Yalow; Queens College; Lehman College; New York University; Courant Institute of Mathematical Sciences; Samuel F.B. Morse; John W. Draper; Columbia University; Polytechnic University; Manhattan Project; American Museum of Natural History; Rockefeller University; New York Public Library. Introduction When I was approached by the editors of Physics in Perspecti6e to prepare an article on New York City for The Physical Tourist section, I was happy to do so. I have been a New Yorker all my life, except for short-term stays elsewhere on sabbatical leaves and other visits. My professional life developed in New York, and I married and raised my family in New York and its environs. Accordingly, writing such an article seemed a natural thing to do. About halfway through its preparation, however, the attack on the World Trade Center took place. -
The BEST WRITING on MATHEMATICS
The BEST WRITING on MATHEMATICS 2012 The BEST WRITING on MATHEMATICS 2012 Mircea Pitici, Editor FOREWORD BY DAVID MUMFORD P RI NC E TO N U N IVER S I T Y P RE SS P RI NC E TO N A N D OX FORD Copyright © 2013 by Princeton University Press Published by Princeton University Press, 41 William Street, Princeton, New Jersey 08540 In the United Kingdom: Princeton University Press, 6 Oxford Street, Woodstock, Oxfordshire OX20 1TW press.princeton.edu All Rights Reserved ISBN 978- 0- 691-15655-2 This book has been composed in Perpetua Printed on acid- free paper. ∞ Printed in the United States of America 1 3 5 7 9 10 8 6 4 2 For my parents Contents Foreword: The Synergy of Pure and Applied Mathematics, of the Abstract and the Concrete DAVID MUMFORD ix Introduction MIRCEA PITICI xvii Why Math Works MARIO LIVIO 1 Is Mathematics Discovered or Invented? TIMOTHY GOWERS 8 The Unplanned Impact of Mathematics PETER ROWLETT 21 An Adventure in the Nth Dimension BRIAN HAYES 30 Structure and Randomness in the Prime Numbers TERENCE TAO 43 The Strangest Numbers in String Theory JOHN C. BAEZ AND JOHN HUERTA 50 Mathematics Meets Photography: The Viewable Sphere DAVID SWART AND BRUCE TORRENCE 61 Dancing Mathematics and the Mathematics of Dance SARAH- MARIE BELCASTRO AND KARL SCHAFFER 79 Can One Hear the Sound of a Theorem? ROB SCHNEIDERMAN 93 Flat- Unfoldability and Woven Origami Tessellations ROBERT J. LANG 113 A Continuous Path from High School Calculus to University Analysis TIMOTHY GOWERS 129 viii Contents Mathematics Teachers’ Subtle, Complex Disciplinary Knowledge BRENT DAVIS 135 How to Be a Good Teacher Is an Undecidable Problem ERICA FLAPAN 141 How Your Philosophy of Mathematics Impacts Your Teaching BONNIE GOLD 149 Variables in Mathematics Education SUSANNA S. -
2020 Mathsoc Integration Bee Qualifiers Solutions
2020 MathSoc Integration Bee Qualifiers Solutions 1. Standard integral, but the bounds are tricky: Z 507 1 x dx = 5072 − 5032 503 2 1 = (507 + 503) (507 − 503) 2 1 = · 1010 · 4 2 = 2020: 2. Rewrite 3ln x as xln 3 using log laws, so now we have a standard integral: Z Z x1+ln 3 3ln x dx = xln 3 dx = + C: 1 + ln 3 3. This is simply integrating ex=2: Z p Z p ex dx = ex=2 dx = 2 ex + C: p 4. Substitute u = ex − 1: Z p Z u2 Z 1 ex − 1 dx = 2 du = 2 1 − du u2 + 1 1 + u2 = 2 u − tan−1 u + C p p = 2 ex − 1 − tan−1 ex − 1 + C: 5. Substitute x = eu then the integral becomes Z eu cos u du: Apply integration by parts twice: Z Z eu cos u du = eu cos u + eu sin u du Z = eu cos u + eu sin u − eu cos u du: Rearrange to obtain Z 1 eu cos u du = eu (cos u + sin u) ; 2 then Z 1 cos (ln x) dx = x (cos (ln x) + sin (ln x)) + C: 2 6. Substitute u = e2x, then Z e2x 1 Z 1 1 1 p dx = p du = sin−1 u + C = sin−1 e2x + C: 1 − e4x 2 1 − u2 2 2 Z 7π=4 4x cos x 7. This is an odd function from "−a to a" so 2 dx = 0. −7π=4 x − sin jxj + cos jxj c UNSW Mathematics Society 2020 π 8. -
Praising the Hard Work of Faculty, Staff, and Students: Excellent Job!
RooMath News Department of Mathematics & Statistics Newsletter http://cas.umkc.edu/Mathematics Volume 10, Issue 1 Praising the Hard Work of Faculty, Fall 2017 Staff, and Students: Excellent Job! Inside this issue: Alumni, students, friends old and students on numerous administrative new, welcome! tasks. Greetings from the De- 1 partment Since the last issue of RooMath News Our graduate and undergradu- The Importance of Sum- 2 there have been several activities fos- ate students have been actively partic- mer Internships tered by faculty, staff and students of ipating and presenting their research Interview: Mary Ellen 2 the UMKC math and stat department. at different conferences such as the Cox -Summer Internship In this short note, we highlight a few Undergraduate Symposium of Re- Industrial Math 4 of them. search & Scholarly Creativity, the Recent Graduates, 6 Math and Stat Research Day, the An- Student News During the 2016-2017 school nual Meeting of SIAM Central States, UMKC Alumna—Love of 15 year, math and stat faculty members Math published more than 24 research arti- and the Joint Mathematics Meetings. UMKC’s Math Competition team par- Post-Quantum Cryptog- 16 cles in well-regarded journals, orga- raphy ticipated in the Missouri Collegiate nized several conferences, seminars, Faculty News Mathematics Competition. 17 and symposia, presented research at Golden Ratio 1-6-18 22 Some students obtained sum- various national and international Math Club, MSGSO mer internships, joined different Re- 23 conferences, trained several graduate Department Contacts search Experience for Undergraduates 24 students and taught more than 60 math and stat courses at both the Summer Programs, published their graduate and undergraduate levels. -
Mathematical Undecidability, Quantum Nonlocality And
MATHEMATICAL UNDECIDABILITY, QUANTUM NONLOCALITY AND THE QUESTION OF THE EXISTENCE OF GOD MATHEMATICAL UNDECIDABILITY, QUANTUM NONLOCALITY AND THE QUESTION OF THE EXISTENCE OF GOD Edited by ALFRED DRIESSEN Department ofApplied Physics, University ofTwente, Enschede, the Netherlands and ANTOINE SUAREZ The Institute for Interdisciplinary Studies, Geneva and Zurich, Switzerland SPRINGER SCIENCE+BUSINESS MEDIA, B.V. Library ofCongress Cataloging-in-Publication Data MatheMatlcal undecldabl1lty, quantuN nonlocallty and the quest Ion of the exlstence of God I Alfred Drlessen, Antolne Suarez, editors. p. cm. Includes blbliographlcal references and Index. ISBN 978-94-010-6283-1 ISBN 978-94-011-5428-4 (eBook) DOI 10.1007/978-94-011-5428-4 1. PhYS1CS--Phl1osophy. 2. Mathe.atlcs--Phl1osophy. 3. Ouantu. theory. 4. Gud--PfQ~f, Ontologieai. I. Drlessen, Alfred. II. Suarez, Antolne. OC6.M357 1997 530' .01--dc20 96-36621 ISBN 978-94-010-6283-1 Printed on acid-free paper All rights reserved © 1997 Springer Science+Business Media Dordrecht Originally published by Kluwer Academic Publishers in 1997 Softcover reprint of the hardcover 1st edition 1997 No part of the material protected by this copyright notice may be reproduced or utilized in any form or by any means, electronic or mechanical, inc1uding photocopying, recording or by any information storage and retrieval system, without written permission from the copyright owner. TABLE OF CONTENTS A. DRIESSEN and A. SUAREZ / Preface vii A. DRIESSEN and A. SUAREZ / Introduction Xl PART I: MATHEMATICS AND UNDECIDABILITY 1. H.-C. REICHEL / How can or should the recent developments in mathematics influence the philosophy of mathematics? 3 2. G.J. CHAITIN / Number and randomness: algorithmic information theory - new results on the foundations of mathematics 15 3. -
Consequences of Theoretically Modeling the Mind As a Computer
PONTIFICIA UNIVERSIDAD CATOLICA DE CHILE ESCUELA DE PSICOLOGIA´ CONSEQUENCES OF THEORETICALLY MODELING THE MIND AS A COMPUTER ESTEBAN HURTADO LEON´ Thesis submitted to the Office of Research and Graduate Studies in partial fulfillment of the requirements for the degree of Doctor in Psychology Advisor: CARLOS CORNEJO ALARCON´ Santiago de Chile, August 2017 c MMXVII, ESTEBAN HURTADO PONTIFICIA UNIVERSIDAD CATOLICA DE CHILE ESCUELA DE PSICOLOGIA´ CONSEQUENCES OF THEORETICALLY MODELING THE MIND AS A COMPUTER ESTEBAN HURTADO LEON´ Members of the Committee: CARLOS CORNEJO ALARCON´ DIEGO COSMELLI SANCHEZ LUIS DISSETT VELEZ JAAN VALSINER ......... Thesis submitted to the Office of Research and Graduate Studies in partial fulfillment of the requirements for the degree of Doctor in Psychology Santiago de Chile, August 2017 c MMXVII, ESTEBAN HURTADO To Carmen and Fulvio ACKNOWLEDGEMENTS I would like to thank the School of Psychology at Pontificia Universidad Catolica´ de Chile for taking me in and walking me through the diversity of the study of the mind. I am in debt to all the teachers who kindly and passionately shared their knowledge with me, and very specially to the kind and helpful work of the administrative staff. I took my first steps in theoretical computer science at the School of Engineering of the same university, with Dr. Alvaro´ Campos, who is no longer with us. His passion for knowledge, dedication and warmth continue to inspire those of us who where lucky enough to cross paths with him. The generous and theoretically profound support of the committee members has been fundamental to the production of this text. I am deeply thankful to all of them. -
Shadows of the Mind: a Search for the Missing Science of Consciousness Pdf
FREE SHADOWS OF THE MIND: A SEARCH FOR THE MISSING SCIENCE OF CONSCIOUSNESS PDF Roger Penrose | 480 pages | 03 Oct 1995 | Vintage Publishing | 9780099582113 | English | London, United Kingdom Shadows of the Mind - Wikipedia Skip to search form Skip to main content You are currently Shadows of the Mind: A Search for the Missing Science of Consciousness. Some features of the site may not work correctly. Penrose Published Psychology, Computer Science. From the Publisher: A New York Times bestseller when it appeared inRoger Penrose's The Emperor's New Mind was universally hailed as a marvelous survey of modern physics as well as a brilliant reflection on the human mind, offering a new perspective on the scientific landscape and a visionary glimpse of the possible future of science. Save to Library. Create Alert. Launch Research Feed. Share This Paper. Penrose Computational Complexity: A Modern Approach. Arora, B. Barak Capra, P. Luisi Figures and Topics from this paper. Citation Type. Has PDF. Publication Type. More Filters. On Gravity's role in Quantum State Reduction. Open Access. Research Feed. Consciousness and Complexity. View 1 excerpt, cites background. Artificial Intelligence: A New Synthesis. Can quantum probability provide a new direction for cognitive modeling? The Newell Test for a theory of cognition. Dynamical Cognitive Science. View 4 excerpts, cites background. References Publications referenced by this paper. Minds, Brains, and Programs. Highly Influential. View 4 excerpts, references background. A logical calculus of the ideas immanent in nervous activity. Simulating physics with computers. Neural networks and physical systems with Shadows of the Mind: A Search for the Missing Science of Consciousness collective computational abilities. -
BULLETIN NEWSLETTER Contents
Bulletin Newsletter Fall 2007 Number 62 BULLETIN NEWSLETTER Contents ✬ ✩Reports from the Society Submissions President’s Report . 2 Submissions and ideas for publica- Past President’s Report . 4 tion are appreciated. They should Board of Directors . 7 be sent to the editor: Minutes from 2007 AGM . .11 Email:[email protected] Committee Membership . 14 Tele: 204-474-7486 ICIAM Report . 16 Fax: 204-474-7602 Report on CAIMS SCMAI 2007 . 18 Mail: Abba Gumel Membership Committee Update . .15 CAIMS SCMAI Secretary Dept. of Mathematics Society Updates University of Manitoba Winnipeg, MB R3T 2N2 2007 Nerenberg Lecture . 20 CAIMS SCMAI Awards . 22 Advertising Rates 2008 Election – Call for Nominations . 23 Inserts and non-advertising submissions (including letters to the editor) should be CAMQ . 23 negotiated with the Secretary. Information CAIMS SCMAI 2008 . 24 about deadlines, payment and acceptable SIAM Reciprocity Agreement . 25 formats should be directed to the Secre- In Memory of Gene Golub . .26 tary. Publication Information News from the Math Institutes The Canadian Applied and Industrial CRM . 29 Mathematics Society / Societ´ e´ Canadi- enne de Mathematiques´ Appliquees´ et In- Fields Institute . 30 dustrielles (CAIMS SCMAI) is a mem- PIMS . .32 ber society of the International Council MITACS . 34 for Industrial and Applied Mathematics (ICIAM). The newsletter is published at least once a year. Upcoming Conferences ................................35 Editors: Abba Gumel and Dhavide Aruliah Design and Production: James Treacy Position Announcements Photographs: Ken Jackson, Jack Macki . .36–40 and Hongbin Guo Back Cover ✫ ✪ICIAM 2011 Announcement 1 Reports from the Society BULLETIN NEWSLETTER Past President’s Report by Bill Langford, CAIMS SCMAI President, 2005–7 The very successful 2007 Annual Meeting in the beautiful setting of the Banff Conference Centre marked the end of my two-year term as President of CAIMS SCMAI.