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    Original Essays | July 14, 2015

    Joshua Mohr: IMG Your Imagination, Your Fingerprint



    When I was in grad school, a teacher told our workshop that if a published novel is 300 pages, the writer had to generate 1,200 along the way. I... Continue »
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      All This Life

      Joshua Mohr 9781593766030

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Geometry & the Imagination

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Synopses & Reviews

Publisher Comments:



The book begins with examples of the simplest curves and surfaces, including thread constructions of certain quadrics and other surfaces. The chapter on regular systems of points leads to the crystallographic groups and the regular polyhedra in \mathbb{R}^3. In this chapter, they also discuss plane lattices. By considering unit lattices, and throwing in a small amount of number theory when necessary, they effortlessly derive Leibniz's series: \pi/4 = 1 - 1/3 + 1/5 - 1/7 + - \ldots. In the section on lattices in three and more dimensions, the authors consider sphere-packing problems, including the famous Kepler problem.

One of the most remarkable chapters is "Projective Configurations". In a short introductory section, Hilbert and Cohn-Vossen give perhaps the most concise and lucid description of why a general geometer would care about projective geometry and why such an ostensibly plain setup is truly rich in structure and ideas. Here, we see regular polyhedra again, from a different perspective. One of the high points of the chapter is the discussion of Schlafli's Double-Six, which leads to the description of the 27 lines on the general smooth cubic surface. As is true throughout the book, the magnificent drawings in this chapter immeasurably help the reader.

A particularly intriguing section in the chapter on differential geometry is Eleven Properties of the Sphere. Which eleven properties of such a ubiquitous mathematical object caught their discerning eye and why? Many mathematicians are familiar with the plaster models of surfaces found in many mathematics departments. The book includes pictures of some of the models that are found in the Göttingen collection. Furthermore, the mysterious lines that mark these surfaces are finally explained!

The chapter on kinematics includes a nice discussion of linkages and the geometry of configurations of points and rods that are connected and, perhaps, constrained in some way. This topic in geometry has become increasingly important in recent times, especially in applications to robotics. This is another example of a simple situation that leads to a rich geometry.

Product Details

ISBN:
9780821819982
Translator:
P. Nemenyi
Publisher:
AMS Chelsea Publishing
Location:
Providence, R.I.
Subject:
Geometry - Non-Euclidean
Copyright:
Edition Number:
2
Edition Description:
Includes bibliographical references and index.
Publication Date:
1999
Binding:
Hardcover
Language:
English
Illustrations:
Yes
Pages:
357

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Related Subjects

» Business » International
» Science and Mathematics » Mathematics » Calculus » Precalculus
» Science and Mathematics » Mathematics » Differential Geometry
» Science and Mathematics » Mathematics » General
» Science and Mathematics » Mathematics » Geometry » Algebraic Geometry
» Science and Mathematics » Mathematics » Geometry » General
» Science and Mathematics » Mathematics » History

Geometry & the Imagination New Hardcover
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Product details 357 pages American Mathematical Society - English 9780821819982 Reviews:
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