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3 e9 P+ Z* i4 i* a: b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:
# y2 _ D1 u5 H, F6 O5 R: WAdventure Games, Permutations, and Spreadsheets/ \" n9 i2 h& u3 m3 j4 ~" A
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" C. g0 I7 e5 n0 t4 B" g9 ^G. Birkhoff and S. MacLane, A Survey of Modern Algebra, revised edition, The MacMillan Company, New York, 1953.' p/ }' _1 l7 n- f. `, S, J
I. N. Herstein, Topics in Algebra, 2nd edition, John Wiley & Sons, Inc., New York, 1975.& X1 ~1 G( V( G% ` }8 E
E. Spitznagel, Jr., A New Look at the Fifteen Puzzle, Mathematics Magazine, Vol. 40 (1967) 171-174.
9 q4 e8 i* k; A3 B: \S.K. Stein, Mathematics: The Man-Made Universe, W.H. Freeman and Company, New York, 1976, Third Edition.* t9 D4 c1 A+ {
R.M. Wilson, Graph Puzzles, Homotopy, and the Alternating Group, Journal of Combinatorial Theory (B) 16 (1974) 86-96.. V7 ~6 o) K3 C4 N# |) r1 n" j
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Acknowledgment. I would like to thank my good friend George Mackiw for his encouragement and support in writing this article. |