Stefanie Ursula Eminger Phd Thesis

Total Page:16

File Type:pdf, Size:1020Kb

Stefanie Ursula Eminger Phd Thesis CARL FRIEDRICH GEISER AND FERDINAND RUDIO: THE MEN BEHIND THE FIRST INTERNATIONAL CONGRESS OF MATHEMATICIANS Stefanie Ursula Eminger A Thesis Submitted for the Degree of PhD at the University of St Andrews 2015 Full metadata for this item is available in Research@StAndrews:FullText at: http://research-repository.st-andrews.ac.uk/ Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/6536 This item is protected by original copyright Carl Friedrich Geiser and Ferdinand Rudio: The Men Behind the First International Congress of Mathematicians Stefanie Ursula Eminger This thesis is submitted in partial fulfilment for the degree of PhD at the University of St Andrews 2014 Thesis Declaration 1. Candidate’s declarations: I, Stefanie Eminger, hereby certify that this thesis, which is approximately 78,500 words in length, has been written by me, and that it is the record of work carried out by me, or principally by myself in collaboration with others as acknowledged, and that it has not been submitted in any previous application for a higher degree. I was admitted as a research student in September 2010 and as a candidate for the degree of PhD in September 2010; the higher study for which this is a record was carried out in the University of St Andrews between 2010 and 2014. Date ……………… Signature of candidate …………………………………… 2. Supervisor’s declaration: I hereby certify that the candidate has fulfilled the conditions of the Resolution and Regulations appropriate for the degree of PhD in the University of St Andrews and that the candidate is qualified to submit this thesis in application for that degree. Date ……………… Signature of supervisor ………………………………….. 3. Permission for publication: In submitting this thesis to the University of St Andrews I understand that I am giving permission for it to be made available for use in accordance with the regulations of the University Library for the time being in force, subject to any copyright vested in the work not being affected thereby. I also understand that the title and the abstract will be published, and that a copy of the work may be made and supplied to any bona fide library or research worker, that my thesis will be electronically accessible for personal or research use unless exempt by award of an embargo as requested below, and that the library has the right to migrate my thesis into new electronic forms as required to ensure continued access to the thesis. I have obtained any third- party copyright permissions that may be required in order to allow such access and migration, or have requested the appropriate embargo below. The following is an agreed request by candidate and supervisor regarding the publication of this thesis: PRINTED COPY a) No embargo on print copy ELECTRONIC COPY a) No embargo on electronic copy Date ………… Signature of candidate ………………………………….. Signature of supervisor …………………………………. Table of Contents Abstract 7 Acknowledgements 9 1. Introduction 11 2. Carl Friedrich Geiser (1843 – 1934) 15 2.1 Life 15 2.2 Connection with Steiner 33 2.3 Impact at the Polytechnic and on Education 39 3. Ferdinand Karl Rudio (1856 – 1929) 49 3.1 Life 49 3.2 Contribution to Euler’s Opera Omnia 53 4. The First International Congress of Mathematicians, Zurich 1897 57 4.1 Background and Organisation 57 4.1.1 Historical Developments 57 4.1.2 Organising the Congress 62 4.1.3 The Congress Itself 67 4.1.4 Geiser’s Contribution 76 4.1.5 Rudio’s Contribution 77 4.2 The Swiss Organising Committee 79 4.2.1 Ernst Julius Amberg (1871 – 1952) 79 4.2.2 Christian Beyel (1854 – 1941) 82 4.2.3 Hermann Bleuler (1837 – 1912) 83 4.2.4 Heinrich Burkhardt (1861 – 1914) 86 4.2.5 Fritz Bützberger (1862 – 1922) 89 4.2.5.1 Bützberger’s Work on Steiner 92 4.2.6 Gustave Dumas (1872 – 1955) 98 4.2.7 Ernst Fiedler (1861 – 1954) 100 4.2.8 Jérôme Franel (1859 – 1939) 103 4.2.9 Walter Gröbli (1852 – 1903) 106 4.2.10 Salomon Eduard Gubler (1845 – 1921) 109 4.2.11 Albin Herzog (1852 – 1909) 111 4.2.12 Arthur Hirsch (1866 – 1948) 113 4.2.13 Adolf Hurwitz (1859 –1919) 115 4.2.14 Adolf Kiefer (1857 – 1929) 121 4.2.15 Gustav Künzler 123 4.2.16 Marius Lacombe (1862 – 1938) 123 4.2.17 Hermann Minkowski (1864 – 1909) 125 4.2.18 Johann Jakob Rebstein (1840 – 1907) 130 4.2.19 Heinrich Friedrich Weber (1843 – 1912) 134 4.2.20 Adolf Weiler (1851 – 1916) 137 5. Geiser’s Schoolbook and Letters to a Schoolteacher 145 5.1 Einleitung in die synthetische Geometrie 145 5.1.1 Background and Motivation 145 5.1.2 Structure and Content 150 5.1.3 Geiser’s Style and Method 165 5.1.3.1 §18: Pole and Polar with Respect to a Circle 167 5.1.4 Reception 169 5.2 Letters to Julius Gysel 175 5.2.1. Julius Gysel (1851 – 1935) 176 5.2.1.1 Letters from Ludwig Schläfli 181 5.2.2. Letters from Geiser 182 6. Rudio as a Historian of Mathematics 193 6.1 Archimedes, Huygens, Lambert, Legendre 193 6.1.1 Background and Motivation 193 6.1.2 Chapter One 196 6.1.3 Chapter Two 198 6.1.4 Chapter Three 205 6.1.5 Chapter Four 207 6.1.6 Reception 212 6.1.7 Comparison of Rudio’s AHLL and Hobson’s Squaring the Circle 215 6.2 The Commentary of Simplicius and Related Papers 224 6.2.1 Motivation 224 6.2.2 Overview of Relevant Papers 228 6.2.3 References to his Papers 238 6.3 Rudio’s Popular Lectures: Leonhard Euler and Über den Antheil der mathematischen Wissenschaften an der Kultur der Renaissance 240 6.3.1 Rathausvorträge 240 6.3.2 Publication 241 6.3.3 Euler Talk 243 6.3.4 Renaissance Talk 246 7. Conclusion 259 Appendix A – Glossary 261 Appendix B – The Federal Polytechnic 265 Appendix C – Publication Lists 273 C.1 – Geiser’s Publications 273 C.2 – Rudio’s Publications 275 Appendix D – Friedrich Robert Scherrer (1854 – 1935) 279 Appendix E – Translations 281 E.1 Material relating to the 1897 ICM 281 E.1.1 Letter from C F Geiser to fellow mathematicians in Zurich 281 E.1.2 Welcoming Speech by Adolf Hurwitz 281 E.1.3 Opening Speech by Carl Friedrich Geiser 282 E.1.4 Closing Speech by Carl Friedrich Geiser 285 E.1.5 Über die Aufgaben und die Organisation internationaler mathematischer Kongresse by Ferdinand Rudio 286 E. 2 Letters 291 E.2.1 Letters from Carl Friedrich Geiser to Julius Gysel (1874 – 1890) 291 E.2.2 Letters from Carl Friedrich Geiser to Fritz Bützberger (1895 – 1907) 301 E.2.3 Letters from Ludwig Schläfli to Julius Gysel (1874 – 1888) 303 E.3 Papers 311 E.3.1 C F Geiser: In Memoriam Jakob Steiner 311 E.3.2 C F Geiser: In Memoriam Theodor Reye 330 E.3.3 F Rudio: Leonhard Euler 348 E.3.4 F Rudio: On the Contribution of Mathematics to the Culture of the Renaissance 357 Bibliography 373 Abstract The first International Congress of Mathematicians (ICM) was held in Zurich in 1897, setting the standards for all future ICMs. Whilst giving an overview of the congress itself, this thesis focuses on the Swiss organisers, who were predominantly university professors and secondary school teachers. As this thesis aims to offer some insight into their lives, it includes their biographies, highlighting their individual contributions to the congress. Furthermore, it explains why Zurich was chosen as the first host city and how the committee proceeded with the congress organisation. Two of the main organisers were the Swiss geometers Carl Friedrich Geiser (1843-1934) and Ferdinand Rudio (1856-1929). In addition to the congress, they also made valuable contributions to mathematical education, and in Rudio’s case, the history of mathematics. Therefore, this thesis focuses primarily on these two mathematicians. As for Geiser, the relationship to his great-uncle Jakob Steiner is explained in more detail. Furthermore, his contributions to the administration of the Swiss Federal Institute of Technology are summarised. Due to the overarching theme of mathematical education and collaborations in this thesis, Geiser’s schoolbook Einleitung in die synthetische Geometrie is considered in more detail and Geiser’s methods are highlighted. A selection of Rudio’s contributions to the history of mathematics is studied as well. His book Archimedes, Huygens, Lambert, Legendre is analysed and compared to E W Hobson’s treatise Squaring the Circle. Furthermore, Rudio’s papers relating to the commentary of Simplicius on quadratures by Antiphon and Hippocrates are considered, focusing on Rudio’s translation of the commentary and on Die Möndchen des Hippokrates. The thesis concludes with an analysis of Rudio’s popular lectures Leonhard Euler and Über den Antheil der mathematischen Wissenschaften an der Kultur der Renaissance, which are prime examples of his approach to the history of mathematics. 7 8 Acknowledgements Firstly, I would like to thank my supervisors, Prof Edmund Robertson and Dr John O’Connor, for taking me on as a research student. Their knowledge, experience, and words of advice and encouragement were invaluable during the past four years. A big thank you also goes to Dr Colva Roney-Dougal for officially supervising me – without her support my PhD would not have been possible. I would like to thank all those who helped me along the way by providing information, pointing out sources, and generally offering advice. They are too numerous for me to name them all individually, but I am grateful for all their contributions as each of them added a little piece to the jigsaw puzzle that is this thesis.
Recommended publications
  • Configurations on Centers of Bankoff Circles 11
    CONFIGURATIONS ON CENTERS OF BANKOFF CIRCLES ZVONKO CERINˇ Abstract. We study configurations built from centers of Bankoff circles of arbelos erected on sides of a given triangle or on sides of various related triangles. 1. Introduction For points X and Y in the plane and a positive real number λ, let Z be the point on the segment XY such that XZ : ZY = λ and let ζ = ζ(X; Y; λ) be the figure formed by three mj utuallyj j tangenj t semicircles σ, σ1, and σ2 on the same side of segments XY , XZ, and ZY respectively. Let S, S1, S2 be centers of σ, σ1, σ2. Let W denote the intersection of σ with the perpendicular to XY at the point Z. The figure ζ is called the arbelos or the shoemaker's knife (see Fig. 1). σ σ1 σ2 PSfrag replacements X S1 S Z S2 Y XZ Figure 1. The arbelos ζ = ζ(X; Y; λ), where λ = jZY j . j j It has been the subject of studies since Greek times when Archimedes proved the existence of the circles !1 = !1(ζ) and !2 = !2(ζ) of equal radius such that !1 touches σ, σ1, and ZW while !2 touches σ, σ2, and ZW (see Fig. 2). 1991 Mathematics Subject Classification. Primary 51N20, 51M04, Secondary 14A25, 14Q05. Key words and phrases. arbelos, Bankoff circle, triangle, central point, Brocard triangle, homologic. 1 2 ZVONKO CERINˇ σ W !1 σ1 !2 W1 PSfrag replacements W2 σ2 X S1 S Z S2 Y Figure 2. The Archimedean circles !1 and !2 together.
    [Show full text]
  • Kaleidoscopic Symmetries and Self-Similarity of Integral Apollonian Gaskets
    Kaleidoscopic Symmetries and Self-Similarity of Integral Apollonian Gaskets Indubala I Satija Department of Physics, George Mason University , Fairfax, VA 22030, USA (Dated: April 28, 2021) Abstract We describe various kaleidoscopic and self-similar aspects of the integral Apollonian gaskets - fractals consisting of close packing of circles with integer curvatures. Self-similar recursive structure of the whole gasket is shown to be encoded in transformations that forms the modular group SL(2;Z). The asymptotic scalings of curvatures of the circles are given by a special set of quadratic irrationals with continued fraction [n + 1 : 1; n] - that is a set of irrationals with period-2 continued fraction consisting of 1 and another integer n. Belonging to the class n = 2, there exists a nested set of self-similar kaleidoscopic patterns that exhibit three-fold symmetry. Furthermore, the even n hierarchy is found to mimic the recursive structure of the tree that generates all Pythagorean triplets arXiv:2104.13198v1 [math.GM] 21 Apr 2021 1 Integral Apollonian gaskets(IAG)[1] such as those shown in figure (1) consist of close packing of circles of integer curvatures (reciprocal of the radii), where every circle is tangent to three others. These are fractals where the whole gasket is like a kaleidoscope reflected again and again through an infinite collection of curved mirrors that encodes fascinating geometrical and number theoretical concepts[2]. The central themes of this paper are the kaleidoscopic and self-similar recursive properties described within the framework of Mobius¨ transformations that maps circles to circles[3]. FIG. 1: Integral Apollonian gaskets.
    [Show full text]
  • 1 Portraits Leonhard Euler Daniel Bernoulli Johann-Heinrich Lambert
    Portraits Leonhard Euler Daniel Bernoulli Johann-Heinrich Lambert Compiled and translated by Oscar Sheynin Berlin, 2010 Copyright Sheynin 2010 www.sheynin.de ISBN 3-938417-01-3 1 Contents Foreword I. Nicolaus Fuss, Eulogy on Leonhard Euler, 1786. Translated from German II. M. J. A. N. Condorcet, Eulogy on Euler, 1786. Translated from French III. Daniel Bernoulli, Autobiography. Translated from Russian; Latin original received in Petersburg in 1776 IV. M. J. A. N. Condorcet, Eulogy on [Daniel] Bernoulli, 1785. In French. Translated by Daniel II Bernoulli in German, 1787. This translation considers both versions V. R. Wolf, Daniel Bernoulli from Basel, 1700 – 1782, 1860. Translated from German VI. Gleb K. Michajlov, The Life and Work of Daniel Bernoullli, 2005. Translated from German VII. Daniel Bernoulli, List of Contributions, 2002 VIII. J. H. S. Formey, Eulogy on Lambert, 1780. Translated from French IX. R. Wolf, Joh. Heinrich Lambert from Mühlhausen, 1728 – 1777, 1860. Translated from German X. J.-H. Lambert, List of Publications, 1970 XI. Oscar Sheynin, Supplement: Daniel Bernoulli’s Instructions for Meteorological Stations 2 Foreword Along with the main eulogies and biographies [i, ii, iv, v, viii, ix], I have included a recent biography of Daniel Bernoulli [vi], his autobiography [iii], for the first time translated from the Russian translation of the Latin original but regrettably incomplete, and lists of published works by Daniel Bernoulli [vii] and Lambert [x]. The first of these lists is readily available, but there are so many references to the works of these scientists in the main texts, that I had no other reasonable alternative.
    [Show full text]
  • Strophoids, a Family of Cubic Curves with Remarkable Properties
    Hellmuth STACHEL STROPHOIDS, A FAMILY OF CUBIC CURVES WITH REMARKABLE PROPERTIES Abstract: Strophoids are circular cubic curves which have a node with orthogonal tangents. These rational curves are characterized by a series or properties, and they show up as locus of points at various geometric problems in the Euclidean plane: Strophoids are pedal curves of parabolas if the corresponding pole lies on the parabola’s directrix, and they are inverse to equilateral hyperbolas. Strophoids are focal curves of particular pencils of conics. Moreover, the locus of points where tangents through a given point contact the conics of a confocal family is a strophoid. In descriptive geometry, strophoids appear as perspective views of particular curves of intersection, e.g., of Viviani’s curve. Bricard’s flexible octahedra of type 3 admit two flat poses; and here, after fixing two opposite vertices, strophoids are the locus for the four remaining vertices. In plane kinematics they are the circle-point curves, i.e., the locus of points whose trajectories have instantaneously a stationary curvature. Moreover, they are projections of the spherical and hyperbolic analogues. For any given triangle ABC, the equicevian cubics are strophoids, i.e., the locus of points for which two of the three cevians have the same lengths. On each strophoid there is a symmetric relation of points, so-called ‘associated’ points, with a series of properties: The lines connecting associated points P and P’ are tangent of the negative pedal curve. Tangents at associated points intersect at a point which again lies on the cubic. For all pairs (P, P’) of associated points, the midpoints lie on a line through the node N.
    [Show full text]
  • 9 · the Growth of an Empirical Cartography in Hellenistic Greece
    9 · The Growth of an Empirical Cartography in Hellenistic Greece PREPARED BY THE EDITORS FROM MATERIALS SUPPLIED BY GERMAINE AUJAe There is no complete break between the development of That such a change should occur is due both to po­ cartography in classical and in Hellenistic Greece. In litical and military factors and to cultural developments contrast to many periods in the ancient and medieval within Greek society as a whole. With respect to the world, we are able to reconstruct throughout the Greek latter, we can see how Greek cartography started to be period-and indeed into the Roman-a continuum in influenced by a new infrastructure for learning that had cartographic thought and practice. Certainly the a profound effect on the growth of formalized know­ achievements of the third century B.C. in Alexandria had ledge in general. Of particular importance for the history been prepared for and made possible by the scientific of the map was the growth of Alexandria as a major progress of the fourth century. Eudoxus, as we have seen, center of learning, far surpassing in this respect the had already formulated the geocentric hypothesis in Macedonian court at Pella. It was at Alexandria that mathematical models; and he had also translated his Euclid's famous school of geometry flourished in the concepts into celestial globes that may be regarded as reign of Ptolemy II Philadelphus (285-246 B.C.). And it anticipating the sphairopoiia. 1 By the beginning of the was at Alexandria that this Ptolemy, son of Ptolemy I Hellenistic period there had been developed not only the Soter, a companion of Alexander, had founded the li­ various celestial globes, but also systems of concentric brary, soon to become famous throughout the Mediter­ spheres, together with maps of the inhabited world that ranean world.
    [Show full text]
  • Volume 6 (2006) 1–16
    FORUM GEOMETRICORUM A Journal on Classical Euclidean Geometry and Related Areas published by Department of Mathematical Sciences Florida Atlantic University b bbb FORUM GEOM Volume 6 2006 http://forumgeom.fau.edu ISSN 1534-1178 Editorial Board Advisors: John H. Conway Princeton, New Jersey, USA Julio Gonzalez Cabillon Montevideo, Uruguay Richard Guy Calgary, Alberta, Canada Clark Kimberling Evansville, Indiana, USA Kee Yuen Lam Vancouver, British Columbia, Canada Tsit Yuen Lam Berkeley, California, USA Fred Richman Boca Raton, Florida, USA Editor-in-chief: Paul Yiu Boca Raton, Florida, USA Editors: Clayton Dodge Orono, Maine, USA Roland Eddy St. John’s, Newfoundland, Canada Jean-Pierre Ehrmann Paris, France Chris Fisher Regina, Saskatchewan, Canada Rudolf Fritsch Munich, Germany Bernard Gibert St Etiene, France Antreas P. Hatzipolakis Athens, Greece Michael Lambrou Crete, Greece Floor van Lamoen Goes, Netherlands Fred Pui Fai Leung Singapore, Singapore Daniel B. Shapiro Columbus, Ohio, USA Steve Sigur Atlanta, Georgia, USA Man Keung Siu Hong Kong, China Peter Woo La Mirada, California, USA Technical Editors: Yuandan Lin Boca Raton, Florida, USA Aaron Meyerowitz Boca Raton, Florida, USA Xiao-Dong Zhang Boca Raton, Florida, USA Consultants: Frederick Hoffman Boca Raton, Floirda, USA Stephen Locke Boca Raton, Florida, USA Heinrich Niederhausen Boca Raton, Florida, USA Table of Contents Khoa Lu Nguyen and Juan Carlos Salazar, On the mixtilinear incircles and excircles,1 Juan Rodr´ıguez, Paula Manuel and Paulo Semi˜ao, A conic associated with the Euler line,17 Charles Thas, A note on the Droz-Farny theorem,25 Paris Pamfilos, The cyclic complex of a cyclic quadrilateral,29 Bernard Gibert, Isocubics with concurrent normals,47 Mowaffaq Hajja and Margarita Spirova, A characterization of the centroid using June Lester’s shape function,53 Christopher J.
    [Show full text]
  • Apollonian Circles Patterns in Musical Scales Posing Problems Triangles
    Summer/Autumn 2017 A Problem Fit for a PrincessApollonian Apollonian Circles Gaskets Polygons and PatternsPrejudice in Exploring Musical Social Scales Issues Daydreams in MusicPosing Patterns Problems in Scales ProblemTriangles, Posing Squares, Empowering & Segregation Participants A NOTE FROM AIM #playwithmath Dear Math Teachers’ Circle Network, In this issue of the MTCircular, we hope you find some fun interdisciplinary math problems to try with your Summer is exciting for us, because MTC immersion MTCs. In “A Problem Fit for a Princess,” Chris Goff workshops are happening all over the country. We like traces the 2000-year history of a fractal that inspired his seeing the updates in real time, on Twitter. Your enthu- MTC’s logo. In “Polygons and Prejudice,” Anne Ho and siasm for all things math and problem solving is conta- Tara Craig use a mathematical frame to guide a con- gious! versation about social issues. In “Daydreams in Music,” Jeremy Aikin and Cory Johnson share a math session Here are some recent tweets we enjoyed from MTC im- motivated by patterns in musical scales. And for those mersion workshops in Cleveland, OH; Greeley, CO; and of you looking for ways to further engage your MTC San Jose, CA, respectively: participants’ mathematical thinking, Chris Bolognese and Mike Steward’s “Using Problem Posing to Empow- What happens when you cooperate in Blokus? er MTC Participants” will provide plenty of food for Try and create designs with rotational symmetry. thought. #toocool #jointhemath – @CrookedRiverMTC — Have MnMs, have combinatorial games Helping regions and states build networks of MTCs @NoCOMTC – @PaulAZeitz continues to be our biggest priority nationally.
    [Show full text]
  • Efficiently Constructing Tangent Circles
    Mathematics Magazine ISSN: 0025-570X (Print) 1930-0980 (Online) Journal homepage: https://www.tandfonline.com/loi/umma20 Efficiently Constructing Tangent Circles Arthur Baragar & Alex Kontorovich To cite this article: Arthur Baragar & Alex Kontorovich (2020) Efficiently Constructing Tangent Circles, Mathematics Magazine, 93:1, 27-32, DOI: 10.1080/0025570X.2020.1682447 To link to this article: https://doi.org/10.1080/0025570X.2020.1682447 Published online: 22 Jan 2020. Submit your article to this journal View related articles View Crossmark data Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=umma20 VOL. 93, NO. 1, FEBRUARY 2020 27 Efficiently Constructing Tangent Circles ARTHUR BARAGAR University of Nevada Las Vegas Las Vegas, NV 89154 [email protected] ALEX KONTOROVICH Rutgers University New Brunswick, NJ 08854 [email protected] The Greek geometers of antiquity devised a game—we might call it geometrical solitaire—which ...mustsurelystand at the very top of any list of games to be played alone. Over the ages it has attracted hosts of players, and though now well over 2000 years old, it seems not to have lost any of its singular charm or appeal. –HowardEves The Problem of Apollonius is to construct a circle tangent to three given ones in a plane. The three circles may also be limits of circles, that is, points or lines; and “con- struct” means using a straightedge and compass. Apollonius’s own solution did not survive antiquity [8], and we only know of its existence through a “mathscinet review” by Pappus half a millennium later.
    [Show full text]
  • MYSTERIES of the EQUILATERAL TRIANGLE, First Published 2010
    MYSTERIES OF THE EQUILATERAL TRIANGLE Brian J. McCartin Applied Mathematics Kettering University HIKARI LT D HIKARI LTD Hikari Ltd is a publisher of international scientific journals and books. www.m-hikari.com Brian J. McCartin, MYSTERIES OF THE EQUILATERAL TRIANGLE, First published 2010. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior permission of the publisher Hikari Ltd. ISBN 978-954-91999-5-6 Copyright c 2010 by Brian J. McCartin Typeset using LATEX. Mathematics Subject Classification: 00A08, 00A09, 00A69, 01A05, 01A70, 51M04, 97U40 Keywords: equilateral triangle, history of mathematics, mathematical bi- ography, recreational mathematics, mathematics competitions, applied math- ematics Published by Hikari Ltd Dedicated to our beloved Beta Katzenteufel for completing our equilateral triangle. Euclid and the Equilateral Triangle (Elements: Book I, Proposition 1) Preface v PREFACE Welcome to Mysteries of the Equilateral Triangle (MOTET), my collection of equilateral triangular arcana. While at first sight this might seem an id- iosyncratic choice of subject matter for such a detailed and elaborate study, a moment’s reflection reveals the worthiness of its selection. Human beings, “being as they be”, tend to take for granted some of their greatest discoveries (witness the wheel, fire, language, music,...). In Mathe- matics, the once flourishing topic of Triangle Geometry has turned fallow and fallen out of vogue (although Phil Davis offers us hope that it may be resusci- tated by The Computer [70]). A regrettable casualty of this general decline in prominence has been the Equilateral Triangle. Yet, the facts remain that Mathematics resides at the very core of human civilization, Geometry lies at the structural heart of Mathematics and the Equilateral Triangle provides one of the marble pillars of Geometry.
    [Show full text]
  • Efficiently Constructing Tangent Circles 3
    EFFICIENTLY CONSTRUCTING TANGENT CIRCLES ARTHUR BARAGAR AND ALEX KONTOROVICH 1. Introduction The famous Problem of Apollonius is to construct a circle tangent to three given ones in a plane. The three circles may also be limits of circles, that is, points or lines, and “construct” of course refers to straightedge and compass. In this note, we consider the problem of constructing tangent circles from the point of view of efficiency. By this we mean using as few moves as possible, where a move is the act of drawing a line or circle. (Points are free as they do not harm the straightedge or compass, and all lines are considered endless, so there is no cost to “extending” a line segment.) Our goal is to present, in what we believe is the most efficient way possible, a construction of four mutually tangent circles. (Five circles of course cannot be mutually tangent in the plane, for their tangency graph, the complete graph K5, is non-planar.) We first present our construction before giving some remarks comparing it to others we found in the literature. 2. Baby Cases: One and Two Circles Constructing one circle obviously costs one move: let A and Z be any distinct points in the plane and draw the circle OA with center A and passing through Z. Given OA, constructing a second circle tangent to it costs two more moves: draw a line through AZ, and put an arbitrary point B on this line (say, outside OA). Now draw the circle OB with center B and passing through Z; then OA and OB are obviously tangent at Z, see Figure 1.
    [Show full text]
  • David Benko, Western Kentucky University
    Abstracts of Talks for the 2008 KYMAA Annual Meeting Western Kentucky University, Bowling Green March 28 - 29, 2008 Note: Undergraduate student speakers are indicated by (u), graduate student speakers are indicated by (g), and faculty speakers are indicated by (f). Contributed Talks: Robert Amundson, Murray State University (u) The Lie Group GL( n, Q ) and Lie Algebra gl( n, Q) The Lie algebra gl( n, Q) is something that has not been investigated before. This presentation will give a general overview of the Lie group GL( n, Q ) and the Lie algebra gl( n, Q) and the motivation for finding the Lie group and Lie Algebra. David Benko, Western Kentucky University (f) The Pros and Cons of Ebay We will present the best buying and selling strategies on Ebay - from a mathematical point of view. We will also propose a better way to rate sellers on Ebay. Disclaimer: I do not own shares of Ebay... Timothy M. Brauch, University of Louisville (g) Counting Perfect Matchings This presentation will show an application of combinatorial nullstellensatz for detecting perfect matchings in bipartite graphs. An elegant circular lock idea will be explored to show some beautiful relationships of graph theory with other branches of mathematics. Some known results as well as open problems will be presented. This is joint work with André E. Kézdy (University of Louisville) and Hunter S. Snevily (University of Idaho). Knowledge of one semester of undergraduate linear algebra will be assumed. Woody Burchett, Georgetown College (u) Thinking Inside the Box: Geometric Interpretations of Quadratic Problems in BM 13901 In my talk I will examine some quadratic problems from the Babylonian Mathematical tablet BM 13901.
    [Show full text]
  • HOMOTECIA Nº 4-16 Abril 2018
    HOMOTECIA Nº 4 – Año 16 Lunes, 2 de Abril de 2018 1 Sobre la descapitalización intelectual y profesional actual en Venezuela. En la última década del siglo XX se realizaron investigaciones sobre educación que arrojaron como resultados, que en Venezuela se estaba produciendo una descapitalización intelectual la cual se definía como la disminución del número de individuos capaces intelectualmente, con destrezas y habilidades propias que puedan generar soluciones óptimas en la resolución significativa de los problemas nacionales primordiales, y que como consecuencia de esto, se le restaba a la nación potencial humano útil para implementar un proceso de desarrollo; todo ello en el contexto de la improductividad de la Educación Media Diversificada y Profesional como consecuencia directa de la deficiente realidad práctica que se vivía en la Educación Básica. La interpretación que se le daba a lo anterior era señalar que aunque los egresados de los estudios secundarios en número se correspondían con la masificación impulsada en el sector por los gobiernos de turno, el devenir de la mayoría de estos egresados en los estudios universitarios sería de transcurrir lento y no muy brillante, es decir tardarían en graduarse en más tiempo del que se estipulaba para ello y con pocos méritos que destacar, haciendo parecer la inversión de recursos económicos en educación como poco exitosa y productora de pérdidas para la nación. Pero aun así, sin que dependiera de la época histórica del momento que se vivía, en el transcurrir de la línea temporal se pudo detectar que los egresados en cada cohorte presentaban un perfil suficientemente satisfactorio que los llevaba, al realizar un mejor esfuerzo posterior, obtener loables méritos, camino válido para alcanzar convertirse a futuro en excelentes profesionales.
    [Show full text]