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États-Unis D'amérique
ÉTATS-UNIS D'AMÉRIQUE Objekttyp: Chapter Zeitschrift: L'Enseignement Mathématique Band (Jahr): 23 (1923) Heft 1: L'ENSEIGNEMENT MATHÉMATIQUE PDF erstellt am: 04.10.2021 Nutzungsbedingungen Die ETH-Bibliothek ist Anbieterin der digitalisierten Zeitschriften. Sie besitzt keine Urheberrechte an den Inhalten der Zeitschriften. Die Rechte liegen in der Regel bei den Herausgebern. Die auf der Plattform e-periodica veröffentlichten Dokumente stehen für nicht-kommerzielle Zwecke in Lehre und Forschung sowie für die private Nutzung frei zur Verfügung. Einzelne Dateien oder Ausdrucke aus diesem Angebot können zusammen mit diesen Nutzungsbedingungen und den korrekten Herkunftsbezeichnungen weitergegeben werden. Das Veröffentlichen von Bildern in Print- und Online-Publikationen ist nur mit vorheriger Genehmigung der Rechteinhaber erlaubt. Die systematische Speicherung von Teilen des elektronischen Angebots auf anderen Servern bedarf ebenfalls des schriftlichen Einverständnisses der Rechteinhaber. Haftungsausschluss Alle Angaben erfolgen ohne Gewähr für Vollständigkeit oder Richtigkeit. Es wird keine Haftung übernommen für Schäden durch die Verwendung von Informationen aus diesem Online-Angebot oder durch das Fehlen von Informationen. Dies gilt auch für Inhalte Dritter, die über dieses Angebot zugänglich sind. Ein Dienst der ETH-Bibliothek ETH Zürich, Rämistrasse 101, 8092 Zürich, Schweiz, www.library.ethz.ch http://www.e-periodica.ch NOTES ET DOCUMENTS Cours universitaires. Année 1923-1924. ÉTATS-UNIS D'AMÉRIQUE University oi Chicago. — Courses which continue for more than one quarter are indicated with Roman numerals, as I, II, III, IV. Prof. E. H. Moore : Hermitian matrices in General Analysis, I, II, III, IV, Y ; Vectors, matrices, and quaternions. — Prof. L. E. Dickson : Hypercomplex numbers, I, II ; Theory of equations. — Prof. H. E. -
Philosophy and the Physicists Preview
L. Susan Stebbing Philosophy and the Physicists Preview il glifo ebooks ISBN: 9788897527466 First Edition: December 2018 (A) Copyright © il glifo, December 2018 www.ilglifo.it 1 Contents FOREWORD FROM THE EDITOR Note to the 2018 electronic edition PHILOSOPHY AND THE PHYSICISTS Original Title Page PREFACE NOTE PART I - THE ALARMING ASTRONOMERS Chapter I - The Common Reader and the Popularizing Scientist Chapter II - THE ESCAPE OF SIR JAMES JEANS PART II - THE PHYSICIST AND THE WORLD Chapter III - ‘FURNITURE OF THE EARTH’ Chapter IV - ‘THE SYMBOLIC WORLD OF PHYSICS’ Chapter V - THE DESCENT TO THE INSCRUTABLE Chapter VI - CONSEQUENCES OF SCRUTINIZING THE INSCRUTABLE PART III - CAUSALITY AND HUMAN FREEDOM Chapter VII - THE NINETEENTH-CENTURY NIGHTMARE Chapter VIII - THE REJECTION OF PHYSICAL DETERMINISM Chapter IX - REACTIONS AND CONSEQUENCES Chapter X - HUMAN FREEDOM AND RESPONSIBILITY PART IV - THE CHANGED OUTLOOK Chapter XI - ENTROPY AND BECOMING Chapter XII - INTERPRETATIONS BIBLIOGRAPHY INDEX BACK COVER Susan Stebbing 2 Foreword from the Editor In 1937 Susan Stebbing published Philosophy and the Physicists , an intense and difficult essay, in reaction to reading the works written for the general public by two physicists then at the center of attention in England and the world, James Jeans (1877-1946) and Arthur Eddington (1882- 1944). The latter, as is known, in 1919 had announced to the Royal Society the astronomical observations that were then considered experimental confirmations of the general relativity of Einstein, and who by that episode had managed to trigger the transformation of general relativity into a component of the mass and non-mass imaginary of the twentieth century. -
Computer Oral History Collection, 1969-1973, 1977
Computer Oral History Collection, 1969-1973, 1977 INTERVIEWEES: John Todd & Olga Taussky Todd INTERVIEWER: Henry S. Tropp DATE OF INTERVIEW: July 12, 1973 Tropp: This is a discussion with Doctor and Mrs. Todd in their apartment at the University of Michigan on July 2nd, l973. This question that I asked you earlier, Mrs. Todd, about your early meetings with Von Neumann, I think are just worth recording for when you first met him and when you first saw him. Olga Tauskky Todd: Well, I first met him and saw him at that time. I actually met him at that location, he was lecturing in the apartment of Menger to a private little set. Tropp: This was Karl Menger's apartment in Vienna? Olga Tauskky Todd: In Vienna, and he was on his honeymoon. And he lectured--I've forgotten what it was about, I am ashamed to say. It would come back, you know. It would come back, but I cannot recall it at this moment. It had nothing to do with game theory. I don't know, something in.... John Todd: She has a very good memory. It will come back. Tropp: Right. Approximately when was this? Before l930? Olga Tauskky Todd: For additional information, contact the Archives Center at 202.633.3270 or [email protected] Computer Oral History Collection, 1969-1973, 1977 No. I think it may have been in 1932 or something like that. Tropp: In '32. Then you said you saw him again at Goettingen, after the-- Olga Tauskky Todd: I saw him at Goettingen. -
Riemannian Geometry and the General Theory of Relativity
University of Montana ScholarWorks at University of Montana Graduate Student Theses, Dissertations, & Professional Papers Graduate School 1967 Riemannian geometry and the general theory of relativity Marie McBride Vanisko The University of Montana Follow this and additional works at: https://scholarworks.umt.edu/etd Let us know how access to this document benefits ou.y Recommended Citation Vanisko, Marie McBride, "Riemannian geometry and the general theory of relativity" (1967). Graduate Student Theses, Dissertations, & Professional Papers. 8075. https://scholarworks.umt.edu/etd/8075 This Thesis is brought to you for free and open access by the Graduate School at ScholarWorks at University of Montana. It has been accepted for inclusion in Graduate Student Theses, Dissertations, & Professional Papers by an authorized administrator of ScholarWorks at University of Montana. For more information, please contact [email protected]. p m TH3 OmERAl THEORY OF RELATIVITY By Marie McBride Vanisko B.A., Carroll College, 1965 Presented in partial fulfillment of the requirements for the degree of Master of Arts UNIVERSITY OF MOKT/JTA 1967 Approved by: Chairman, Board of Examiners D e a ^ Graduante school V AUG 8 1967, Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. V W Number: EP38876 All rights reserved INFORMATION TO ALL USERS The quality of this reproduotion is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missir^ pages, these will be noted. Also, if matedal had to be removed, a note will indicate the deletion. UMT Oi*MMtion neiitNna UMi EP38876 Published ProQuest LLQ (2013). -
Riemannian Geometry Learning for Disease Progression Modelling Maxime Louis, Raphäel Couronné, Igor Koval, Benjamin Charlier, Stanley Durrleman
Riemannian geometry learning for disease progression modelling Maxime Louis, Raphäel Couronné, Igor Koval, Benjamin Charlier, Stanley Durrleman To cite this version: Maxime Louis, Raphäel Couronné, Igor Koval, Benjamin Charlier, Stanley Durrleman. Riemannian geometry learning for disease progression modelling. 2019. hal-02079820v2 HAL Id: hal-02079820 https://hal.archives-ouvertes.fr/hal-02079820v2 Preprint submitted on 17 Apr 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Riemannian geometry learning for disease progression modelling Maxime Louis1;2, Rapha¨elCouronn´e1;2, Igor Koval1;2, Benjamin Charlier1;3, and Stanley Durrleman1;2 1 Sorbonne Universit´es,UPMC Univ Paris 06, Inserm, CNRS, Institut du cerveau et de la moelle (ICM) 2 Inria Paris, Aramis project-team, 75013, Paris, France 3 Institut Montpelli`erainAlexander Grothendieck, CNRS, Univ. Montpellier Abstract. The analysis of longitudinal trajectories is a longstanding problem in medical imaging which is often tackled in the context of Riemannian geometry: the set of observations is assumed to lie on an a priori known Riemannian manifold. When dealing with high-dimensional or complex data, it is in general not possible to design a Riemannian geometry of relevance. In this paper, we perform Riemannian manifold learning in association with the statistical task of longitudinal trajectory analysis. -
An Introduction to Riemannian Geometry with Applications to Mechanics and Relativity
An Introduction to Riemannian Geometry with Applications to Mechanics and Relativity Leonor Godinho and Jos´eNat´ario Lisbon, 2004 Contents Chapter 1. Differentiable Manifolds 3 1. Topological Manifolds 3 2. Differentiable Manifolds 9 3. Differentiable Maps 13 4. Tangent Space 15 5. Immersions and Embeddings 22 6. Vector Fields 26 7. Lie Groups 33 8. Orientability 45 9. Manifolds with Boundary 48 10. Notes on Chapter 1 51 Chapter 2. Differential Forms 57 1. Tensors 57 2. Tensor Fields 64 3. Differential Forms 66 4. Integration on Manifolds 72 5. Stokes Theorem 75 6. Orientation and Volume Forms 78 7. Notes on Chapter 2 80 Chapter 3. Riemannian Manifolds 87 1. Riemannian Manifolds 87 2. Affine Connections 94 3. Levi-Civita Connection 98 4. Minimizing Properties of Geodesics 104 5. Hopf-Rinow Theorem 111 6. Notes on Chapter 3 114 Chapter 4. Curvature 115 1. Curvature 115 2. Cartan’s Structure Equations 122 3. Gauss-Bonnet Theorem 131 4. Manifolds of Constant Curvature 137 5. Isometric Immersions 144 6. Notes on Chapter 4 150 1 2 CONTENTS Chapter 5. Geometric Mechanics 151 1. Mechanical Systems 151 2. Holonomic Constraints 160 3. Rigid Body 164 4. Non-Holonomic Constraints 177 5. Lagrangian Mechanics 186 6. Hamiltonian Mechanics 194 7. Completely Integrable Systems 203 8. Notes on Chapter 5 209 Chapter 6. Relativity 211 1. Galileo Spacetime 211 2. Special Relativity 213 3. The Cartan Connection 223 4. General Relativity 224 5. The Schwarzschild Solution 229 6. Cosmology 240 7. Causality 245 8. Singularity Theorem 253 9. Notes on Chapter 6 263 Bibliography 265 Index 267 CHAPTER 1 Differentiable Manifolds This chapter introduces the basic notions of differential geometry. -
Council for Innovative Research Peer Review Research Publishing System
ISSN 2347-3487 Einstein's gravitation is Einstein-Grossmann's equations Alfonso Leon Guillen Gomez Independent scientific researcher, Bogota, Colombia E-mail: [email protected] Abstract While the philosophers of science discuss the General Relativity, the mathematical physicists do not question it. Therefore, there is a conflict. From the theoretical point view “the question of precisely what Einstein discovered remains unanswered, for we have no consensus over the exact nature of the theory's foundations. Is this the theory that extends the relativity of motion from inertial motion to accelerated motion, as Einstein contended? Or is it just a theory that treats gravitation geometrically in the spacetime setting?”. “The voices of dissent proclaim that Einstein was mistaken over the fundamental ideas of his own theory and that their basic principles are simply incompatible with this theory. Many newer texts make no mention of the principles Einstein listed as fundamental to his theory; they appear as neither axiom nor theorem. At best, they are recalled as ideas of purely historical importance in the theory's formation. The very name General Relativity is now routinely condemned as a misnomer and its use often zealously avoided in favour of, say, Einstein's theory of gravitation What has complicated an easy resolution of the debate are the alterations of Einstein's own position on the foundations of his theory”, (Norton, 1993) [1]. Of other hand from the mathematical point view the “General Relativity had been formulated as a messy set of partial differential equations in a single coordinate system. People were so pleased when they found a solution that they didn't care that it probably had no physical significance” (Hawking and Penrose, 1996) [2]. -
Arxiv:1601.07125V1 [Math.HO]
CHALLENGES TO SOME PHILOSOPHICAL CLAIMS ABOUT MATHEMATICS ELIAHU LEVY Abstract. In this note some philosophical thoughts and observations about mathematics are ex- pressed, arranged as challenges to some common claims. For many of the “claims” and ideas in the “challenges” see the sources listed in the references. .1. Claim. The Antinomies in Set Theory, such as the Russell Paradox, just show that people did not have a right concept about sets. Having the right concept, we get rid of any contradictions. Challenge. It seems that this cannot be honestly said, when often in “axiomatic” set theory the same reasoning that leads to the Antinomies (say to the Russell Paradox) is used to prove theorems – one does not get to the contradiction, but halts before the “catastrophe” to get a theorem. As if the reasoning that led to the Antinomies was not “illegitimate”, a result of misunderstanding, but we really have a contradiction (antinomy) which we, somewhat artificially, “cut”, by way of the axioms, to save our consistency. One may say that the phenomena described in the famous G¨odel’s Incompleteness Theorem are a reflection of the Antinomies and the resulting inevitability of an axiomatics not entirely parallel to intuition. Indeed, G¨odel’s theorem forces us to be presented with a statement (say, the consistency of Arithmetics or of Set Theory) which we know we cannot prove, while intuition puts a “proof” on the tip of our tongue, so to speak (that’s how we “know” that the statement is true!), but which our axiomatics, forced to deviate from intuition to be consistent, cannot recognize. -
Gravity Without Dark Matter
Gravity Without Dark Matter John Moffat Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada 1/13/2005 Miami 2004 1 Contents n 1. Introduction n 2. Gravity theory n 3. Action and field equations n 4. Quantum gravity and group renormalization flow n 5. Modified Newtonian acceleration n and flat galaxy rotation curves n 6. Galaxy clusters and lensing n 7. Cosmology without dark matter n 8. Conclusions 1/13/2005 Miami 2004 2 1. Introduction n Can gravity theory explain galaxy dynamics and cosmology without dominant dark matter? n We need a gravity theory that generalizes GR. Such a generalization is nonsymmetric gravitational theory (NGT). n A simpler theory is metric-skew-tensor gravity (MSTG). n There is also the problem of the nature of Dark Energy that explains the accelerating Universe. n The gravity theory must be stable and contain GR in a consistent way. It must yield agreement with solar system tests and the binary pulsar PSR 1913+16. n The cosmology without dominant dark matter must agree with the latest WMAP and CMB data. 1/13/2005 Miami 2004 3 2. Gravity theory n A popular phenomenological model that replaces dark matter is MOND (Milgrom, Beckenstein, Sanders-McGough). This phenomenology fits the flat rotation curves of galaxies, but has no acceptable relativistic gravity theory (see, however, Beckenstein 2004). n The MSTG theory can explain flat rotation curves of galaxies and cosmology without dominant dark matter. n We need to incorporate quantum gravity in a renormalization group (RG) flow framework with effective running coupling “constants” and an effective action. -
The 29 of May Or Sir Arthur and The
International Journal of Management and Applied Science, ISSN: 2394-7926 Volume-4, Issue-4, Apr.-2018 http://iraj.in THE 29TH OF MAY OR SIR ARTHUR AND THE BENDING LIGHT (TEACHING SCIENCE AND LITERATURE JOINTLY) MICHAEL KATZ Faculty of Education, Haifa University, Mount Carmel, Haifa, Israel E-mail: [email protected] Abstract - In this paper I present an instance illustrating a program of joint teaching of science and literature. The instance sketched here rests on recognition that at the age when children read books like Kästner's "The 35th of May" they can already taste notions of Relativity Theory through the story of Eddington's expedition to Principe Island. Eddington's story is briefly recounted here with references to Kästner's book. The relationships thus exhibited between science and fiction, fantasy and reality, theory and actuality, humor and earnestness, should help evoke school age children's interest in science and literature at early stages in their studies' endeavor. Keywords - Bending Light, Fantasy, Gravitation, Relativity, Science and Literature. I. INTRODUCTION South Seas" – a story of adventure and humor by Erich Kästner, the well known German author of The idea that teaching science and humanities in more than a few dearly loved novels, mostly for primary and secondary schools needn't necessarily be children and adolescents. The book was first seen as disjoint objectives is prevalent in the thought published in German in 1931 and in English shortly and practice of more than a few scholars and teachers after. in recent years. Carole Cox [1], for example, unfolds forty strategies of literature based teaching of various Twelve years earlier, in 1919, another journey topics in arts and sciences. -
Equivalence Principle (WEP) of General Relativity Using a New Quantum Gravity Theory Proposed by the Authors Called Electro-Magnetic Quantum Gravity Or EMQG (Ref
WHAT ARE THE HIDDEN QUANTUM PROCESSES IN EINSTEIN’S WEAK PRINCIPLE OF EQUIVALENCE? Tom Ostoma and Mike Trushyk 48 O’HARA PLACE, Brampton, Ontario, L6Y 3R8 [email protected] Monday April 12, 2000 ACKNOWLEDGMENTS We wish to thank R. Mongrain (P.Eng) for our lengthy conversations on the nature of space, time, light, matter, and CA theory. ABSTRACT We provide a quantum derivation of Einstein’s Weak Equivalence Principle (WEP) of general relativity using a new quantum gravity theory proposed by the authors called Electro-Magnetic Quantum Gravity or EMQG (ref. 1). EMQG is manifestly compatible with Cellular Automata (CA) theory (ref. 2 and 4), and is also based on a new theory of inertia (ref. 5) proposed by R. Haisch, A. Rueda, and H. Puthoff (which we modified and called Quantum Inertia, QI). QI states that classical Newtonian Inertia is a property of matter due to the strictly local electrical force interactions contributed by each of the (electrically charged) elementary particles of the mass with the surrounding (electrically charged) virtual particles (virtual masseons) of the quantum vacuum. The sum of all the tiny electrical forces (photon exchanges with the vacuum particles) originating in each charged elementary particle of the accelerated mass is the source of the total inertial force of a mass which opposes accelerated motion in Newton’s law ‘F = MA’. The well known paradoxes that arise from considerations of accelerated motion (Mach’s principle) are resolved, and Newton’s laws of motion are now understood at the deeper quantum level. We found that gravity also involves the same ‘inertial’ electromagnetic force component that exists in inertial mass. -
Revised Theory of Gravity Doesn't Predict a Big Bang 12 July 2010, by Lisa Zyga
Revised theory of gravity doesn't predict a Big Bang 12 July 2010, By Lisa Zyga decades he became more interested in finding a theory to unify gravity and quantum mechanics - a task that is still being studied today. In 1924, Eddington proposed a new “gravitational action” as an alternative to the Einstein-Hilbert action, which could serve as an alternative starting point to general relativity. In astrophysics, a gravitational action is the mechanism that describes how gravity can emerge from space-time being curved by matter and energy. However, Eddington’s theory of gravity only worked for empty space and didn’t Illustration: Time Line of the Universe Credit: include any source of energy such as matter, NASA/WMAP making it an incomplete theory. Since Eddington’s proposal, scientists have attempted various ways of including matter into the (PhysOrg.com) -- The Big Bang theory has formed theory, although they have run into problems. In the basis of our understanding of the universe's this study, Banados and Ferreira have tried a new origins since it was first proposed in 1927 by way to extend the theory to include matter by using Georges Lemaitre. And for good reason: the theory a gravitational action called the Born-Infeld action. is supported by scientists' latest observations and experiments, and is based on Einstein's widely In their analysis, the scientists found that a key accepted theory of general relativity. But scientists characteristic of Eddington’s revised theory of are always on the lookout for any evidence that gravity is that it reproduces Einstein gravity might suggest an alternative to the Big Bang.