Index 311 Cayley, 274, 275 random, 273 shifting, 5 graph paper, 55 Grax, 277 Gray, Jeremy, xix grooming, 17, 18 group, 274 abelian, 257, 259 additive, 19 algebraic, 259 Coxeter, xix, 4, 24, 33, 43, 49–51, 56, 57, 90, 271 cyclic, 257–259 Euclidean reflection, 92 finite reflection, 24, 90 finitely generated, 274 finitely presented, 264 hyperbolic, 264 hyperbolic reflection, 90, 91 ideal class, 259 infinitesimal, 81 Lie, 19, 39, 81, 233, 245 local, 80 Minkowski, 39, 41 multiplicative, 19, 258 of fixed points, 41 of isometries, 19 of translations, 80 orthogonal, 39, 243 quantum, 269 reflection, 23, 33, 37, 39, 43 special linear, 39 spinor, 39 symmetric, 192, 193 unipotent, 259 Grunbaum, ¨ Branko, 42 Gurevich, Yuri, 9 Gymnarchus niloticus, 25, 75 Habsieger, Laurent, 58 Hadamard, Jacques, 135, 152, 205 Hales, Thomas, 148 Hardy, G. H., xvii, 155, 157, 159 Hartshorne, Robin, 244, 245 Haydn, Franz Joseph, 69 Henderson, David, 29, 77, 87 Hersh, Reuben, xiv, xv, xix, 30, 117, 188, 191, 192, 217, 220, 223 Herstein, I. N., 261, 278 Hilbert, David, 143, 229 Hill, Ray, xix, 231, 233 Hipparchus, 57–59 Hippocrates, 143 Hjelmslev, Johannes, 245 Hjorth, Greg, 273 Hobbs, Chris, xix, 10, 20 Hobby, David, 264 Hodges, Wilfrid, 69, 185 Hofmann, Karl Heinrich, 238 Hokusai, Katsushika, 178, 179 Hough, David, 57 Hoyles, Celia, 165 Høyrup, Jens, 11 Hull, Thomas, xix, 244 Humiaki Huzita, 244 Humphrey, Nicholas, 36 hydroacoustic, 172 hydrodynamics, 256 hyperplane, 23 icosahedron, 37, 38, 90, 207 identity, 249, 263 Jacobi, 242 idiot savant, 195 image processing, 25 infinity, 89, 93, 95, 108 actual, 89 potential, 89, 99 integer p-adic, 114 integral Lebesgue, 147 interiorization, xv, 31–33, 44, 52, 53, 64, 276 interpolation, 4 interpretation, 53 intuition, 63 geometric, 25, 77 sensorimotor, 81 inversion, 269 IQ, 44 ISBN, 231, 233, 236 Ishihara, Shuji, 65 Jacobi identity, 243 Johansson, Mikael, 88 Jones, Alexander, xix, 87 Kakuro, 15 Kalm´ ´ 168 Kaneko, Kunihiko, 64, 65
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