Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 248
A Bottom of Box B We may represent the various stages in the game by sup-posing that the blank space, occupying the sixteenth cell, ismoved over the board, ending finally where it started. The route pursued by the blank space may consist partly oftracks followed and again retraced, which have no…
Mathematical recreations · Geometry · Astrology · Space and time · Matter · Magic squares
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