By Christoph Bandelow
On January 30, 1975 Ernd Rubik j r. , professor of structure and layout in Budapest, was once granted the Hungarian patent quantity 170062 for a "terbeli logikai jatek"-a video game of spatial good judgment. among 1978 and March 1981 this object-Bt1vos Kocka in Hungary, der Magische Wiirfel or Zauberwiirfel in Germany, Ie dice Hongrois in France and the Magic dice or Rubik' s dice in nice Britain and the USA-has bought greater than ten million copies. and so they weren't simply offered! A hugely contagious "twist mania" has been spreading all through households, places of work and ready rooms. Many study rooms sound as though a military of mice have been challenging at paintings at the back of the desks. what's so attention-grabbing approximately this dice, which competes with Hungar ian salami and the recognized Tokajer wine within the currency-winning export marketplace? For something, it's an grand technical instrument. How does it paintings? furthermore, the distinction among its blameless, harmless visual appeal and the hidden trouble of its answer deals a major problem to all puzzle enthusiasts, yet particularly to these mathematicians who're profeSSionally considering logical deduction.
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Extra resources for Inside Rubik's Cube and Beyond
CHAPTER THREE Henry Ernest Dudeney: England’s Greatest Puzzlist henry ernest dudeney was England’s greatest inventor of puzzles; indeed, he may well have been the greatest puzzlist who ever lived. Today there is scarcely a single puzzle book that does not contain (often without credit) dozens of brilliant mathematical problems that had their origin in Dudeney’s fertile imagination. He was born in the English village of Mayfield in 1857. Thus he was 16 years younger than Sam Loyd, the American puzzle genius.
THE SLIDING PENNIES Six pennies are arranged on a flat surface as shown in Figure 25. The problem is to move them into the formation depicted at bottom in the smallest number of moves. Each move consists in sliding a penny, without disturbing any of the other pennies, to a new Nine Problems 43 position in which it touches two others. The coins must remain flat on the surface at all times. 8. HANDSHAKES AND NETWORKS Prove that at a recent convention of biophysicists the number of scientists in attendance who shook hands an odd number of times is even.
A different version of the problem can be found in Clark Kinnaird’s Encyclopedia of Puzzles and Pastimes, 1946, but the answer is incorrect. Correct probability figures for Kinnaird’s version are given in The American Mathematical Monthly, December 1948, page 640. 50 Origami, Eleusis, and the Soma Cube Figure 29. (Artist: Harold Jacobs) POSTSCRIPT Gwen Roberts, writing on “Shadows and Plugs” in Puzzler’s Tribute (edited by David Wolfe and Tom Rodgers, A K Peters, 2002), introduces a variant of the three holes and one plug.
Inside Rubik's Cube and Beyond by Christoph Bandelow