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; X1 x' E% d5 x7 b3 j& \关于 2、战栗(Shivers) ,网上有篇妙文详细分析游戏中的一个谜题。原始链接已损坏,还好我几年前将网页保存下来。下面跟大家共享:1 @, ] }; P' V3 c; |+ m$ p3 n
Adventure Games, Permutations, and Spreadsheets( \. R8 y- i# Z; H/ ?
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3 k* ?, }+ N( _9 E' o4 o+ G/ LG. Birkhoff and S. MacLane, A Survey of Modern Algebra, revised edition, The MacMillan Company, New York, 1953.1 P5 c. `# L$ k7 j" D/ s' D
I. N. Herstein, Topics in Algebra, 2nd edition, John Wiley & Sons, Inc., New York, 1975.* F, E( Y0 ]+ R: U
E. Spitznagel, Jr., A New Look at the Fifteen Puzzle, Mathematics Magazine, Vol. 40 (1967) 171-174.9 K, w2 V$ h$ L# x( d* ~
S.K. Stein, Mathematics: The Man-Made Universe, W.H. Freeman and Company, New York, 1976, Third Edition.
, b/ `) h) O9 C" ?1 CR.M. Wilson, Graph Puzzles, Homotopy, and the Alternating Group, Journal of Combinatorial Theory (B) 16 (1974) 86-96.
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Acknowledgment. I would like to thank my good friend George Mackiw for his encouragement and support in writing this article. |