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                    | Stillwell J. — Yearning for the Impossible: The Surprising Truths of Mathematics |  
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                    | Предметный указатель |  
                    | |  197 
  25 26 197 
  and the limit concept      208 
  as a line of points      201 
  is not countable      197 202 
  , stands for real      27 
  197 
  143 197 
  and regular polyhedra      144 
  , rotations of      146 
  149 
  and regular polytopes      151 
  , tilings of      153 
  135 
  84 
  is transcendental      207 
  , computation of      85 
  , evaluation by calculus      96 
  , Indian formula      85 198 208 
  , not constructible      208 
  25 
  , as a symbol      213 
  , obeys laws of algebra      33 
  1 13 
  and decimal fractions      13 
  and Huclidean algorithm      17 
  as a gap in the rationals      14 197 
  as infinite decimal      15 209 
  in geometry      7 
  , continued fraction for      16 19 
  , irrationality of      9 18 22 162 120-cell      151
 2-gon      181
 2-sphere      104 108
 2-torus      187
 2-torus as a doubly periodic plane      191
 2-torus, constructed from square      187
 2-torus, topological properties      188
 24-cell      147 149
 24-cell, shadow      151
 24-cell, tiling of
  153 3-cylinder      177 183 189
 3-cylinder contains tribar      183
 3-sphere      104 108 189
 3-sphere, stereographic image      107
 3-torus      188 189
 3-torus as periodic space      188
 3-torus, constructed from cube      188
 4-cube      150
 4-orthoplex      150
 4-simplex      150
 600-cell      151
 Abel, Niel Henrik      195
 Absolute value      35
 Absolute value, multiplicative property      35 129
 Absolute value, multiplicative property, and two-square identity      130
 Absolute value, multiplicative property, for quaternions      139
 Adams, John Couch      33
 Adcquality      91
 Addition in projective geometry      72
 Addition of angles      38 186
 Addition of equivalence classes      186
 Addition, multiplication perceived as      4
 Addition, vector      131 136
 Additive identity      70
 Additive, inverse      70 131
 al-Khazin, Abu Ja'far      35
 Al-Khwarizmi, Abu Ja'far Muhammed ibn Musa      9
 Alberti, Leon Battista      55
 Algebra      10
 Algebra and projective coincidences      69
 Algebra, laws of      69
 Algebra, linear      127
 Algebraic-curve      44
 Algebraic-curve, geometry      87
 Algebraic-curve, number      205
 Algebraic-curve, topology      195
 Angle sum theorem      110
 Angle sum theorem and flatness      114
 Angle sum theorem of Gauss      112
 Angle sum theorem on 2-sphere      111 112
 Angle sum theorem on 2-sphere, Harriot proof      112
 Angles and the parallel axiom      50
 Angles as equivalence classes      186
 Angles of pentagon      124
 Angles, addition of      186
 Angles, additive property      36
 Apollonius      88
 Archimedes      84
 Area and slope      93
 Area as sum of infinitesimals      93
 Area of disk      84
 Area of parallelogram      79
 Area of polygons      77
 Area of rectangle      78
 Area of square      5
 Area of triangle      79
 Area, equality of      10
 Aristophanes      207
 Arithmetization      126
 Artmann, Benno      28
 Associative law      70
 Axiom, Desargues      65
 Axiom, incidence      60
 Axiom, Pappus      65 76
 Axiom, parallel      49 71
 Axiom, parallel, of Bolyai and Lobachevsky      126
 Axiom, parallel, of Euclid      126
 Axioms about lines      127
 Axioms of Euclid      126
 Axioms of geometry      76
 Axioms of projective geometry      76
 Axioms of set theory      209
 Axioms, Euclid-style      76
 Axioms, inner product      76
 Axioms, vector space      76
 Bach, Johann Sebastian      21
 Beeckman, Isaac      3
 Beeckman, Isaac, law      3
 Beltrami, Eugenio      119 124
 Beltrami, Eugenio, assumed Euclidean space      125
 Berkeley, George      99
 Bernoulli, Daniel      190
 Bezout, Etienne      45
 Black holes      125
 Bolyai, Janos      115 125
 Bombelli, Rafael      32 36
 Bosse, Abraham      62
 Brewer Dictionary      207
 Broombridge      138
 Bruegel, Pieter      179
 Bryson, Bill      55
 Burke, Robert      138
 Calculus      96 99
 Calculus and elliptic functions      191
 Calculus, infinitesimal      100 200
 Calculus, notation      99
 Calcut, Jack      168
 Cantor, Georg      201
 Cantor, Georg, and diagonal argument      204
 Cantor, Georg, and the continuum problem      209
 Cantor, Georg, and transcendental numbers      206
 Cantor, Georg, discovered uncountability      202
 Cardano, Girolamo, Ars Magna      30 41
 Cardano, Girolamo, formula      32 34
 Carroll, Lewis      98
 Cassiodorus      9
 Cayley, Arthur      62 144
 Circular functions      190
 Claudius Ptolemy      107
 
 | Cohn-Vossen, Stefan      151 Coincidence      61
 Coincidence and laws of algebra      72
 Coincidence, projective explanation      67
 Coincidence, projective explanation, via Pappus and Desargues      72
 Columbus, Christopher      101 156
 Common divisors      12
 Common measure      1
 Common measure by Euclidean algorithm      16
 Commutative law      70
 Commutative law, abandoned by Hamilton      136
 Commutative law, fails for quaternions      138
 Complex conjugate      141
 Complex curves      45
 Complex, factors      44
 Complex, functions      45 191
 Complex, numbers      see numbers complex
 Complex, origin of word      44
 Complex, period      191
 Complex, points      45
 Congruent triangles      73
 Conic sections      62 88
 Conic sections, equations of      88
 Conjugation map      144
 Continued fraction      19
 Continued fraction, for
  19 Continuum problem      209
 coordinates      51 127
 Coordinates and the parallel axiom      51 52
 Coordinates, origin of      51 87
 Cosine      42 190
 Cosine, hyperbolic      116
 Costrtizione legillima      55
 Countability      200
 Countability of algebraic numbers      200
 Countability of rational numbers      200
 Countability, implies zero length      203
 Coxeter, Harold Scott MacUonald      152
 cube      144
 Cube and 3-torus      188
 Cube n-dimensional      153
 Cube, symmetry      145
 Cubic curves      62
 Cubic equations      30 41
 Cubic equations, Cardano formula      32
 Curvature      101
 Curvature and angle sum      112
 Curvature and infinitesimals      126
 Curvature of a circle      114
 Curvature of a smooth curve      116
 Curvature of a sphere      114
 Curvature of a surface      116
 Curvature of latitude circles      105
 Curvature, constant negative      118
 Curvature, detection      108
 Curvature, Gaussian      114 117
 Curvature, Gaussian, negative      117
 Curvature, Gaussian, of cylinder      117
 Curvature, Gaussian, positive      117
 Curvature, Gaussian, zero      117
 Curvature, negative      116
 Curvature, principal      117
 Curvature, variable      125
 Curved space      xi 108
 Cutting and pasting      11 78
 Cylinder      109
 Cylinder and the plane      180
 Cylinder as a periodic plane      181 182
 Cylinder, curvature of      117
 Cylinder, flatness of      109 182
 Cylinder, geodesies on      109 177 182
 Cylinder, locally like a plane      109 180
 Cylinder, non-Euclidean      119
 Cylinder, seal      181
 Cylinder, three-dimensional      177 183
 Cylinder, two-sided polygon on      177
 Dante Alighieri      101 103
 De la Hire, Phillipe      62
 Decimal fractions      13
 Dedekind, Richard      172
 Dedekind, Richard, and
  201 Dedekind, Richard, and ideals      173
 Dedekind, Richard, Continuity and Irrational Numbers      201
 Dedekind, Richard, cuts      202
 Definition of line      202
 Degree      44
 Dehn, Max      11
 del Ferro, Scipione      30
 Desargues, Girard      62
 Desargues, Girard, theorem      63
 Desargues, Girard, theorem, as an axiom      65
 Desargues, Girard, theorem, spatial version      63
 Descartes, Rene      41
 Descartes, Rene, and conic sections      88
 Descartes, Rene, and length of curves      77 208
 Descartes, Rene, coordinate geometry      51 71
 Descartes, Rene, factor theorem      41
 Descartes, Rene, Geometry      41 77
 Diagonal argument      203
 Diagonal argument for uncountability      204
 Diagonalization      see diagonal argument
 DIMENSION      127 135
 Diophantus      34
 Diophantus, "product" of triangles      35
 Diophantus, Arithmetica      34 170
 Diophantus, two-square identity      34 130 140
 Diophantus, two-square identity, and multiplicative norm      167
 Discriminant      30
 Distance and absolute value      38
 Distance in the hyperbolic plane      123
 Distance in the plane      38
 Distance on the pseudosphere and disk      121
 Distributive law      26 70
 Distributive law for areas      28
 Distributive law for quaternions      137
 Distributive law in Euclid      28
 Distributive law in Greek geometry      27
 Distributive law, used by Stevin      27
 Divine Comedy      101
 Divisibility      12 158
 Division of Gaussian integers      164
 Division of positive integers      158
 Division property of Gaussian integers      165
 Division property of integers      159
 Division with remainder      158
 Division with remainder in Gaussian integers      164
 Division with remainder in positive integers      159
 dodecahedron      144
 Dodecahedron and dodecahedral space      189
 Dodecahedron, symmetry      146
 Duerer, Albrecht      48
 e      43
 e is transcendental      207
 Eight-square identity      140
 Einstein, Albert      127
 Elements      12
 Elements and regular polyhedra      144
 Elements, Book II      28
 Elements, Book IX      159
 Elements, Book V      12 13
 Elements, Book VII      12 16 161
 Elements, Book X      18
 Elements, Book XII      81
 Elements, unique prime factorization      155
 Elements, unstated assumptions      126
 ellipse      191
 Elliptic functions      191
 Elliptic functions as functions on 2-torus      191
 Elliptic functions, periodicity of      191
 Elliptic integrals      191
 
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