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New mathematical pastimes (1921)

MacMahon, Percy Alexander, 1854-1929 · Cambridge [Eng.] The University press · leaf 114

An illustration from New mathematical pastimes, 1921, leaf 114 — SYMMETRY OF PATTERN 99 This is shewn by the diagrams 1 20 e with one aspect, 1 20 d with two aspects and 1 20 e with four aspects. \2 / \2// \l/ \3X \1/ \3/ 1Y3 1X3 1X3 lX3 IX3 1X3 IX3 1X3 / 4 \ / 4\ /3\ /l\ / 3\ / 3 \ \2/ \ 2 / \l/ \ 1/ \3/ 43 lY3 1Y3 1X3 1X3 1X3 3\l IX3 3X1 /4\ X3\ /1 \ /3\ /3\… … Fig. 121. 7—2

Mathematical recreations

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