Regular Polytopes
Polytopes are geometrical figures bounded by portions of lines, planes, or hyperplanes. In plane (two dimensional) geometry, they are known as polygons and comprise such figures as triangles, squares, pentagons, etc. In solid (three dimensional) geometry they are known as polyhedra and include such figures as tetrahedra (a type of pyramid), cubes, icosahedra, and many more; the possibilities, in fact, are infinite! H. S. M. Coxeter's book is the foremost book available on regular polyhedra, incorporating not only the ancient Greek work on the subject, but also the vast amount of information that has been accumulated on them since, especially in the last hundred years. The author, professor of Mathematics, University of Toronto, has contributed much valuable work himself on polytopes and is a well-known authority on them. Professor Coxeter begins with the fundamental concepts of plane and solid geometry and then moves on to multi-dimensionality. Among the many subjects covered are Euler's formula, rotation groups, star-polyhedra, truncation, forms, vectors, coordinates, kaleidoscopes, Petrie polygons, sections and projections, and star-polytopes. Each chapter ends with a historical summary showing when and how the information contained therein was discovered. Numerous figures and examples and the author's lucid explanations also help to make the text readily comprehensible. Although the study of polytopes does have some practical applications to mineralogy, architecture, linear programming, and other areas, most people enjoy contemplating these figures simply because their symmetrical shapes have an aesthetic appeal. But whatever the reasons, anyone with an elementary knowledge of geometry and trigonometry will find this one of the best source books available on this fascinating study.
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Regular Polytopes
Polytopes are geometrical figures bounded by portions of lines, planes, or hyperplanes. In plane (two dimensional) geometry, they are known as polygons and comprise such figures as triangles, squares, pentagons, etc. In solid (three dimensional) geometry they are known as polyhedra and include such figures as tetrahedra (a type of pyramid), cubes, icosahedra, and many more; the possibilities, in fact, are infinite! H. S. M. Coxeter's book is the foremost book available on regular polyhedra, incorporating not only the ancient Greek work on the subject, but also the vast amount of information that has been accumulated on them since, especially in the last hundred years. The author, professor of Mathematics, University of Toronto, has contributed much valuable work himself on polytopes and is a well-known authority on them. Professor Coxeter begins with the fundamental concepts of plane and solid geometry and then moves on to multi-dimensionality. Among the many subjects covered are Euler's formula, rotation groups, star-polyhedra, truncation, forms, vectors, coordinates, kaleidoscopes, Petrie polygons, sections and projections, and star-polytopes. Each chapter ends with a historical summary showing when and how the information contained therein was discovered. Numerous figures and examples and the author's lucid explanations also help to make the text readily comprehensible. Although the study of polytopes does have some practical applications to mineralogy, architecture, linear programming, and other areas, most people enjoy contemplating these figures simply because their symmetrical shapes have an aesthetic appeal. But whatever the reasons, anyone with an elementary knowledge of geometry and trigonometry will find this one of the best source books available on this fascinating study.
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Regular Polytopes

Regular Polytopes

by H. S. M. Coxeter
Regular Polytopes
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Regular Polytopes

Regular Polytopes

by H. S. M. Coxeter

Overview

Polytopes are geometrical figures bounded by portions of lines, planes, or hyperplanes. In plane (two dimensional) geometry, they are known as polygons and comprise such figures as triangles, squares, pentagons, etc. In solid (three dimensional) geometry they are known as polyhedra and include such figures as tetrahedra (a type of pyramid), cubes, icosahedra, and many more; the possibilities, in fact, are infinite! H. S. M. Coxeter's book is the foremost book available on regular polyhedra, incorporating not only the ancient Greek work on the subject, but also the vast amount of information that has been accumulated on them since, especially in the last hundred years. The author, professor of Mathematics, University of Toronto, has contributed much valuable work himself on polytopes and is a well-known authority on them. Professor Coxeter begins with the fundamental concepts of plane and solid geometry and then moves on to multi-dimensionality. Among the many subjects covered are Euler's formula, rotation groups, star-polyhedra, truncation, forms, vectors, coordinates, kaleidoscopes, Petrie polygons, sections and projections, and star-polytopes. Each chapter ends with a historical summary showing when and how the information contained therein was discovered. Numerous figures and examples and the author's lucid explanations also help to make the text readily comprehensible. Although the study of polytopes does have some practical applications to mineralogy, architecture, linear programming, and other areas, most people enjoy contemplating these figures simply because their symmetrical shapes have an aesthetic appeal. But whatever the reasons, anyone with an elementary knowledge of geometry and trigonometry will find this one of the best source books available on this fascinating study.

Product Details

ISBN-13: 9780486141589
Publisher: Dover Publications
Publication date: 05/23/2012
Series: Dover Books on Mathematics
Sold by: Barnes & Noble
Format: eBook
Pages: 368
File size: 16 MB
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About the Author

H. S. M. Coxeter: Through the Looking Glass Harold Scott MacDonald Coxeter (1907–2003) is one of the greatest geometers of the last century, or of any century, for that matter. Coxeter was associated with the University of Toronto for sixty years, the author of twelve books regarded as classics in their field, a student of Hermann Weyl in the 1930s, and a colleague of the intriguing Dutch artist and printmaker Maurits Escher in the 1950s. In the Author's Own Words:"I'm a Platonist — a follower of Plato — who believes that one didn't invent these sorts of things, that one discovers them. In a sense, all these mathematical facts are right there waiting to be discovered." "In our times, geometers are still exploring those new Wonderlands, partly for the sake of their applications to cosmology and other branches of science, but much more for the sheer joy of passing through the looking glass into a land where the familiar lines, planes, triangles, circles, and spheres are seen to behave in strange but precisely determined ways." "Geometry is perhaps the most elementary of the sciences that enable man, by purely intellectual processes, to make predictions (based on observation) about the physical world. The power of geometry, in the sense of accuracy and utility of these deductions, is impressive, and has been a powerful motivation for the study of logic in geometry." "Let us revisit Euclid. Let us discover for ourselves a few of the newer results. Perhaps we may be able to recapture some of the wonder and awe that our first contact with geometry aroused." — H. S. M. Coxeter

Table of Contents

I. POLYGONS AND POLYHEDRA 1·1 Regular polygons 1·2 Polyhedra 1·3 The five Platonic Solids 1·4 Graphs and maps 1·5 "A voyage round the world" 1·6 Euler's Formula 1·7 Regular maps 1·8 Configurations 1·9 Historical remarksII. REGULAR AND QUASI-REGULAR SOLIDS 2·1 Regular polyhedra 2·2 Reciprocation 2·3 Quasi-regular polyhedra 2·4 Radii and angles 2·5 Descartes' Formula 2·6 Petrie polygons 2·7 The rhombic dodecahedron and triacontahedron 2·8 Zonohedra 2·9 Historical remarksIII. ROTATION GROUPS 3·1 Congruent transformations 3·2 Transformations in general 3·3 Groups 3·4 Symmetry opperations 3·5 The polyhedral groups 3·6 The five regular compounds 3·7 Coordinates for the vertices of the regular and quasi-regular solids 3·8 The complete enumeration of finite rotation groups 3·9 Historical remarksIV. TESSELLATIONS AND HONEYCOMBS 4·1 The three regular tessellations 4·2 The quasi-regular and rhombic tessellations 4·3 Rotation groups in two dimensions 4·4 Coordinates for the vertices 4·5 Lines of symmetry 4·6 Space filled with cubes 4·7 Other honeycombs 4·8 Proportional numbers of elements 4·9 Historical remarksV. THE KALEIDOSCOPE 5·1 "Reflections in one or two planes, or lines, or points" 5·2 Reflections in three or four lines 5·3 The fundamental region and generating relations 5·4 Reflections in three concurrent planes 5·5 "Reflections in four, five, or six planes" 5·6 Representation by graphs 5·7 Wythoff's construction 5·8 Pappus's observation concerning reciprocal regular polyhedra 5·9 The Petrie polygon and central symmetry 5·x Historical remarksVI. STAR-POLYHEDRA 6·1 Star-polygons 6·2 Stellating the Platonic solids 6·3 Faceting the Platonic solids 6·4 The general regular polyhedron 6·5 A digression on Riemann surfaces 6·6 Ismorphism 6·7 Are there only nine regular polyhedra? 6·8 Scwarz's triangles 6·9 Historical remarksVII. ORDINARY POLYTOPES IN HIGHER SPACE 7·1 Dimensional analogy 7·2 "Pyramids, dipyramids, and prisms" 7·3 The general sphere 7·4 Polytopes and honeycombs 7·5 Regularity 7·6 The symmetry group of the general regular polytope 7·7 Schäfli's criterion 7·8 The enumeration of possible regular figures 7·9 The characteristic simplex 7·10 Historical remarksVIII. TRUNCATION 8·1 The simple truncations of the genral regular polytope 8·2 "Cesàro's construction for {3, 4, 3}" 8·3 Coherent indexing 8·4 "The snub {3, 4, 3}" 8·5 "Gosset's construction for {3, 3, 5}" 8·6 "Partial truncation, or alternation" 8·7 Cartesian coordinates 8·8 Metrical properties 8·9 Historical remarksIX. POINCARÉ'S PROOF OF EULER'S FORMULA 9·1 Euler's Formula as generalized by Schläfli 9·2 Incidence matrices 9·3 The algebra of k-chains 9·4 Linear dependence and rank 9·5 The k-circuits 9·6 The bounding k-circuits 9·7 The condition for simple-connectivity 9·8 The analogous formula for a honeycomb 9·9 Polytopes which do not satisfy Euler's FormulaX. "FORMS, VECTORS, AND COORDINATES" 10·1 Real quadratic forms 10·2 Forms with non-positive product terms 10·3 A criterion for semidefiniteness 10·4 Covariant and contravariant bases for a vector space 10·5 Affine coordinates and reciprocal lattices 10·6 The general reflection 10·7 Normal coordinates 10·8 The simplex determined by n + 1 dependent vectors 10·9 Historical remarksXI.
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