Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 253
t consists of anumber of rings hung upon a bar in such a manner that thering at one end (say A) can be taken off or put on the barat pleasure; but any other ring can be taken off or put ononly when the one next to it towards A is on, and all therest towards A are off the bar. The order of the rings… … To simplify the discussion I shall assume at first that only onering is taken off or put on at a time.] I proceed to show that,if there are n rings, then in order to disconnect them from thebar, it will be necessary to take a ring off or to put a ring oneither J (2**+^— 1) times or J (2^+^ — 2)…
Mathematical recreations · Geometry · Astrology · Space and time · Matter · Magic squares
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