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Jean-Baptiste Charles Joseph Bélanger (1790-1874), the Backwater Equation and the Bélanger Equation
THE UNIVERSITY OF QUEENSLAND DIVISION OF CIVIL ENGINEERING REPORT CH69/08 JEAN-BAPTISTE CHARLES JOSEPH BÉLANGER (1790-1874), THE BACKWATER EQUATION AND THE BÉLANGER EQUATION AUTHOR: Hubert CHANSON HYDRAULIC MODEL REPORTS This report is published by the Division of Civil Engineering at the University of Queensland. Lists of recently-published titles of this series and of other publications are provided at the end of this report. Requests for copies of any of these documents should be addressed to the Civil Engineering Secretary. The interpretation and opinions expressed herein are solely those of the author(s). Considerable care has been taken to ensure accuracy of the material presented. Nevertheless, responsibility for the use of this material rests with the user. Division of Civil Engineering The University of Queensland Brisbane QLD 4072 AUSTRALIA Telephone: (61 7) 3365 3619 Fax: (61 7) 3365 4599 URL: http://www.eng.uq.edu.au/civil/ First published in 2008 by Division of Civil Engineering The University of Queensland, Brisbane QLD 4072, Australia © Chanson This book is copyright ISBN No. 9781864999211 The University of Queensland, St Lucia QLD JEAN-BAPTISTE CHARLES JOSEPH BÉLANGER (1790-1874), THE BACKWATER EQUATION AND THE BÉLANGER EQUATION by Hubert CHANSON Professor, Division of Civil Engineering, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia Ph.: (61 7) 3365 3619, Fax: (61 7) 3365 4599, Email: [email protected] Url: http://www.uq.edu.au/~e2hchans/ REPORT No. CH69/08 ISBN 9781864999211 Division of Civil Engineering, The University of Queensland August 2008 Jean-Baptiste BÉLANGER (1790-1874) (Courtesy of the Bibliothèque de l'Ecole Nationale Supérieure des Ponts et Chaussées) Abstract In an open channel, the transition from a high-velocity open channel flow to a fluvial motion is a flow singularity called a hydraulic jump. -
The Quest for Pi David H. Bailey, Jonathan M. Borwein, Peter B
The Quest for Pi David H. Bailey, Jonathan M. Borwein, Peter B. Borwein and Simon Plouffe June 25, 1996 Ref: Mathematical Intelligencer, vol. 19, no. 1 (Jan. 1997), pg. 50–57 Abstract This article gives a brief history of the analysis and computation of the mathematical constant π =3.14159 ..., including a number of the formulas that have been used to compute π through the ages. Recent developments in this area are then discussed in some detail, including the recent computation of π to over six billion decimal digits using high-order convergent algorithms, and a newly discovered scheme that permits arbitrary individual hexadecimal digits of π to be computed. D. Bailey: NASA Ames Research Center, Mail Stop T27A-1, Moffett Field, CA 94035-1000. E-mail: [email protected]. J. Borwein: Dept. of Mathematics and Statistics, Simon Fraser University Burnaby, BC V5A 1S6 Canada. Email: [email protected]. This work was supported by NSERC and the Shrum Endowment at Simon Fraser University. P. Borwein: Dept. of Mathematics and Statistics, Simon Fraser University Burnaby, BC V5A 1S6 Canada. Email: [email protected]. S. Plouffe: Dept. of Mathematics and Statistics, Simon Fraser University Burnaby, BC V5A 1S6 Canada. Email: [email protected]. 1 Introduction The fascinating history of the constant we now know as π spans several millennia, almost from the beginning of recorded history up to the present day. In many ways this history parallels the advancement of science and technology in general, and of mathematics and computer technology in particular. An overview of this history is presented here in sections one and two. -
Arxiv:2107.06030V2 [Math.HO] 18 Jul 2021 Jonathan Michael Borwein
Jonathan Michael Borwein 1951 { 2016: Life and Legacy Richard P. Brent∗ Abstract Jonathan M. Borwein (1951{2016) was a prolific mathematician whose career spanned several countries (UK, Canada, USA, Australia) and whose many interests included analysis, optimisation, number theory, special functions, experimental mathematics, mathematical finance, mathematical education, and visualisation. We describe his life and legacy, and give an annotated bibliography of some of his most significant books and papers. 1 Life and Family Jonathan (Jon) Michael Borwein was born in St Andrews, Scotland, on 20 May 1951. He was the first of three children of David Borwein (1924{2021) and Bessie Borwein (n´eeFlax). It was an itinerant academic family. Both Jon's father David and his younger brother Peter Borwein (1953{2020) are well-known mathematicians and occasional co-authors of Jon. His mother Bessie is a former professor of anatomy. The Borweins have an Ashkenazy Jewish background. Jon's father was born in Lithuania, moved in 1930 with arXiv:2107.06030v4 [math.HO] 15 Sep 2021 his family to South Africa (where he met his future wife Bessie), and moved with Bessie to the UK in 1948. There he obtained a PhD (London) and then a Lectureship in St Andrews, Scotland, where Jon was born and went to school at Madras College. The family, including Jon and his two siblings, moved to Ontario, Canada, in 1963. In 1971 Jon graduated with a BA (Hons ∗Mathematical Sciences Institute, Australian National University, Canberra, ACT. Email: <[email protected]>. 1 Math) from the University of Western Ontario. It was in Ontario that Jon met his future wife and lifelong partner Judith (n´eeRoots). -
Proclus on the Elements and the Celestial Bodies
PROCLUS ON THE ELEMENTS AND THE CELESTIAL BODIES PHYSICAL TH UGHT IN LATE NEOPLAT NISM Lucas Siorvanes A Thesis submitted for the Degree of Doctor of Philosophy to the Dept. of History and Philosophy of Science, Science Faculty, University College London. Deuember 1986 - 2 - ABSTRACT Until recently, the period of Late Antiquity had been largely regarded as a sterile age of irrationality and of decline in science. This pioneering work, supported by first-hand study of primary sources, argues that this opinion is profoundly mistaken. It focuses in particular on Proclus, the head of the Platonic School at Athens in the 5th c. AD, and the chief spokesman for the ideas of the dominant school of thought of that time, Neoplatonism. Part I, divided into two Sections, is an introductory guide to Proclus' philosophical and cosmological system, its general principles and its graded ordering of the states of existence. Part II concentrates on his physical theories on the Elements and the celestial bodies, in Sections A and B respectively, with chapters (or sub-sections) on topics including the structure, properties and motion of the Elements; light; space and matter; the composition and motion of the celestial bodies; and the order of planets. The picture that emerges from the study is that much of the Aristotelian physics, so prevalent in Classical Antiquity, was rejected. The concepts which were developed instead included the geometrization of matter, the four-Element composition of the universe, that of self-generated, free motion in space for the heavenly bodies, and that of immanent force or power. -
A Note on the Origin of the Twin Prime Conjecture
A Note on the Origin of the Twin Prime Conjecture by William Dunham Department of Mathematics & Computer Science, Muhlenberg College; Department of Mathematics, Harvard University (visiting 2012-2013) More than any other branch of mathematics, number As the title suggests, de Polignac’s paper was about theory features a collection of famous problems that took prime numbers, and on p. 400 he stated two “theorems.” centuries to be proved or that remain unresolved to the It should be noted that he was not using the word in its present day. modern sense. Rather, de Polignac confirmed the truth of Among the former is Fermat’s Last Theorem. This these results by checking a number of cases and thereby states that it is impossible to find a whole number n ≥ 3 called them “theorems.” Of course, we would call them, at and whole numbers x , y , and z for which xn + yn = zn . best, “conjectures.” The true nature of these statements is suggested by the fact that de Polignac introduced them In 1640, as all mathematicians know, Fermat wrote this in under the heading “Induction and remarks” as seen below, a marginal note and claimed to have “an admirable proof” in a facsimile of his original text. that, alas, did not fit within the space available. The result remained unproved for 350 years until Andrew Wiles, with assistance from Richard Taylor, showed that Fermat was indeed correct. On the other hand, there is the Goldbach conjecture, which asserts that every even number greater than 2 can be expressed as the sum of two primes. -
GYRODYNAMICS Introduction to the Dynamics of Rigid Bodies
2 GYRODYNAMICS Introduction to the dynamics of rigid bodies Introduction. Though Newton wrote on many topics—and may well have given thought to the odd behavior of tops—I am not aware that he committed any of that thought to writing. But by Euler was active in the field, and it has continued to bedevil the thought of mathematical physicists. “Extended rigid bodies” are classical abstractions—alien both to relativity and to quantum mechanics—which are revealed to our dynamical imaginations not so much by commonplace Nature as by, in Maxwell’s phrase, the “toys of Youth.” That such toys behave “strangely” is evident to the most casual observer, but the detailed theory of their behavior has become notorious for being elusive, surprising and difficult at every turn. Its formulation has required and inspired work of wonderful genius: it has taught us much of great worth, and clearly has much to teach us still. Early in my own education as a physicist I discovered that I could not understand—or, when I could understand, remained unpersuaded by—the “elementary explanations” of the behavior of tops & gyros which are abundant in the literature. So I fell into the habit of avoiding the field, waiting for the day when I could give to it the time and attention it obviously required and deserved. I became aware that my experience was far from atypical: according to Goldstein it was in fact a similar experience that motivated Klein & Sommerfeld to write their 4-volume classic, Theorie des Kreisels (–). In November I had occasion to consult my Classical Mechanics II students concerning what topic we should take up to finish out the term. -
Year XIX, Supplement Ethnographic Study And/Or a Theoretical Survey of a Their Position in the Article Should Be Clearly Indicated
III. TITLES OF ARTICLES DRU[TVO ANTROPOLOGOV SLOVENIJE The journal of the Slovene Anthropological Society Titles (in English and Slovene) must be short, informa- SLOVENE ANTHROPOLOGICAL SOCIETY Anthropological Notebooks welcomes the submis- tive, and understandable. The title should be followed sion of papers from the field of anthropology and by the name of the author(s), their position, institutional related disciplines. Submissions are considered for affiliation, and if possible, by e-mail address. publication on the understanding that the paper is not currently under consideration for publication IV. ABSTRACT AND KEYWORDS elsewhere. It is the responsibility of the author to The abstract must give concise information about the obtain permission for using any previously published objective, the method used, the results obtained, and material. Please submit your manuscript as an e-mail the conclusions. Authors are asked to enclose in English attachment on [email protected] and enclose your contact information: name, position, and Slovene an abstract of 100 – 200 words followed institutional affiliation, address, phone number, and by three to five keywords. They must reflect the field of e-mail address. research covered in the article. English abstract should be placed at the beginning of an article and the Slovene one after the references at the end. V. NOTES A N T H R O P O L O G I C A L INSTRUCTIONS Notes should also be double-spaced and used sparingly. They must be numbered consecutively throughout the text and assembled at the end of the article just before references. VI. QUOTATIONS Short quotations (less than 30 words) should be placed in single quotation marks with double marks for quotations within quotations. -
Comparative Literature in Slovenia
CLCWeb: Comparative Literature and Culture ISSN 1481-4374 Purdue University Press ©Purdue University Volume 2 (2000) Issue 4 Article 11 Comparative Literature in Slovenia Kristof Jacek Kozak University of Alberta Follow this and additional works at: https://docs.lib.purdue.edu/clcweb Part of the Comparative Literature Commons, and the Critical and Cultural Studies Commons Dedicated to the dissemination of scholarly and professional information, Purdue University Press selects, develops, and distributes quality resources in several key subject areas for which its parent university is famous, including business, technology, health, veterinary medicine, and other selected disciplines in the humanities and sciences. CLCWeb: Comparative Literature and Culture, the peer-reviewed, full-text, and open-access learned journal in the humanities and social sciences, publishes new scholarship following tenets of the discipline of comparative literature and the field of cultural studies designated as "comparative cultural studies." Publications in the journal are indexed in the Annual Bibliography of English Language and Literature (Chadwyck-Healey), the Arts and Humanities Citation Index (Thomson Reuters ISI), the Humanities Index (Wilson), Humanities International Complete (EBSCO), the International Bibliography of the Modern Language Association of America, and Scopus (Elsevier). The journal is affiliated with the Purdue University Press monograph series of Books in Comparative Cultural Studies. Contact: <[email protected]> Recommended Citation Kozak, Kristof Jacek. "Comparative Literature in Slovenia." CLCWeb: Comparative Literature and Culture 2.4 (2000): <https://doi.org/10.7771/1481-4374.1094> This text has been double-blind peer reviewed by 2+1 experts in the field. The above text, published by Purdue University Press ©Purdue University, has been downloaded 2344 times as of 11/ 07/19. -
February 2009
How Euler Did It by Ed Sandifer Estimating π February 2009 On Friday, June 7, 1779, Leonhard Euler sent a paper [E705] to the regular twice-weekly meeting of the St. Petersburg Academy. Euler, blind and disillusioned with the corruption of Domaschneff, the President of the Academy, seldom attended the meetings himself, so he sent one of his assistants, Nicolas Fuss, to read the paper to the ten members of the Academy who attended the meeting. The paper bore the cumbersome title "Investigatio quarundam serierum quae ad rationem peripheriae circuli ad diametrum vero proxime definiendam maxime sunt accommodatae" (Investigation of certain series which are designed to approximate the true ratio of the circumference of a circle to its diameter very closely." Up to this point, Euler had shown relatively little interest in the value of π, though he had standardized its notation, using the symbol π to denote the ratio of a circumference to a diameter consistently since 1736, and he found π in a great many places outside circles. In a paper he wrote in 1737, [E74] Euler surveyed the history of calculating the value of π. He mentioned Archimedes, Machin, de Lagny, Leibniz and Sharp. The main result in E74 was to discover a number of arctangent identities along the lines of ! 1 1 1 = 4 arctan " arctan + arctan 4 5 70 99 and to propose using the Taylor series expansion for the arctangent function, which converges fairly rapidly for small values, to approximate π. Euler also spent some time in that paper finding ways to approximate the logarithms of trigonometric functions, important at the time in navigation tables. -
EUROPEAN MATHEMATICAL SOCIETY EDITOR-IN-CHIEF ROBIN WILSON Department of Pure Mathematics the Open University Milton Keynes MK7 6AA, UK E-Mail: [email protected]
CONTENTS EDITORIAL TEAM EUROPEAN MATHEMATICAL SOCIETY EDITOR-IN-CHIEF ROBIN WILSON Department of Pure Mathematics The Open University Milton Keynes MK7 6AA, UK e-mail: [email protected] ASSOCIATE EDITORS VASILE BERINDE Department of Mathematics, University of Baia Mare, Romania e-mail: [email protected] NEWSLETTER No. 47 KRZYSZTOF CIESIELSKI Mathematics Institute March 2003 Jagiellonian University Reymonta 4 EMS Agenda ................................................................................................. 2 30-059 Kraków, Poland e-mail: [email protected] Editorial by Sir John Kingman .................................................................... 3 STEEN MARKVORSEN Department of Mathematics Executive Committee Meeting ....................................................................... 4 Technical University of Denmark Building 303 Introducing the Committee ............................................................................ 7 DK-2800 Kgs. Lyngby, Denmark e-mail: [email protected] An Answer to the Growth of Mathematical Knowledge? ............................... 9 SPECIALIST EDITORS Interview with Vagn Lundsgaard Hansen .................................................. 15 INTERVIEWS Steen Markvorsen [address as above] Interview with D V Anosov .......................................................................... 20 SOCIETIES Krzysztof Ciesielski [address as above] Israel Mathematical Union ......................................................................... 25 EDUCATION Tony Gardiner -
History of the Numerical Methods of Pi
History of the Numerical Methods of Pi By Andy Yopp MAT3010 Spring 2003 Appalachian State University This project is composed of a worksheet, a time line, and a reference sheet. This material is intended for an audience consisting of undergraduate college students with a background and interest in the subject of numerical methods. This material is also largely recreational. Although there probably aren't any practical applications for computing pi in an undergraduate curriculum, that is precisely why this material aims to interest the student to pursue their own studies of mathematics and computing. The time line is a compilation of several other time lines of pi. It is explained at the bottom of the time line and further on the worksheet reference page. The worksheet is a take-home assignment. It requires that the student know how to construct a hexagon within and without a circle, use iterative algorithms, and code in C. Therefore, they will need a variety of materials and a significant amount of time. The most interesting part of the project was just how well the numerical methods of pi have evolved. Currently, there are iterative algorithms available that are more precise than a graphing calculator with only a single iteration of the algorithm. This is a far cry from the rough estimate of 3 used by the early Babylonians. It is also a different entity altogether than what the circle-squarers have devised. The history of pi and its numerical methods go hand-in-hand through shameful trickery and glorious achievements. It is through the evolution of these methods which I will try to inspire students to begin their own research. -
Augustin-Louis Cauchy - Wikipedia, the Free Encyclopedia 1/6/14 3:35 PM Augustin-Louis Cauchy from Wikipedia, the Free Encyclopedia
Augustin-Louis Cauchy - Wikipedia, the free encyclopedia 1/6/14 3:35 PM Augustin-Louis Cauchy From Wikipedia, the free encyclopedia Baron Augustin-Louis Cauchy (French: [oɡystɛ̃ Augustin-Louis Cauchy lwi koʃi]; 21 August 1789 – 23 May 1857) was a French mathematician who was an early pioneer of analysis. He started the project of formulating and proving the theorems of infinitesimal calculus in a rigorous manner, rejecting the heuristic Cauchy around 1840. Lithography by Zéphirin principle of the Belliard after a painting by Jean Roller. generality of algebra exploited by earlier Born 21 August 1789 authors. He defined Paris, France continuity in terms of Died 23 May 1857 (aged 67) infinitesimals and gave Sceaux, France several important Nationality French theorems in complex Fields Mathematics analysis and initiated the Institutions École Centrale du Panthéon study of permutation École Nationale des Ponts et groups in abstract Chaussées algebra. A profound École polytechnique mathematician, Cauchy Alma mater École Nationale des Ponts et exercised a great Chaussées http://en.wikipedia.org/wiki/Augustin-Louis_Cauchy Page 1 of 24 Augustin-Louis Cauchy - Wikipedia, the free encyclopedia 1/6/14 3:35 PM influence over his Doctoral Francesco Faà di Bruno contemporaries and students Viktor Bunyakovsky successors. His writings Known for See list cover the entire range of mathematics and mathematical physics. "More concepts and theorems have been named for Cauchy than for any other mathematician (in elasticity alone there are sixteen concepts and theorems named for Cauchy)."[1] Cauchy was a prolific writer; he wrote approximately eight hundred research articles and five complete textbooks. He was a devout Roman Catholic, strict Bourbon royalist, and a close associate of the Jesuit order.