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4 I, [" X, P* P1 i9 o& O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:" o+ W0 w v- r# d/ H% [4 M
Adventure Games, Permutations, and Spreadsheets$ \0 ` Z( V# M) [0 v. n6 U
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References+ W. \% e( {; c( J4 y) Z) |2 ?
- S( d3 ~3 I- Z4 n; t- r/ aG. Birkhoff and S. MacLane, A Survey of Modern Algebra, revised edition, The MacMillan Company, New York, 1953.
! l1 v. [9 d5 }$ o: q/ ?, e9 U% \I. N. Herstein, Topics in Algebra, 2nd edition, John Wiley & Sons, Inc., New York, 1975.& C* {/ [, Q3 P" t
E. Spitznagel, Jr., A New Look at the Fifteen Puzzle, Mathematics Magazine, Vol. 40 (1967) 171-174.
6 r; @& R+ T3 U6 B- A8 \S.K. Stein, Mathematics: The Man-Made Universe, W.H. Freeman and Company, New York, 1976, Third Edition.
- W6 @. I, z0 }" ?3 q9 G5 SR.M. Wilson, Graph Puzzles, Homotopy, and the Alternating Group, Journal of Combinatorial Theory (B) 16 (1974) 86-96.2 f3 [6 N- y) X+ Q4 h
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Acknowledgment. I would like to thank my good friend George Mackiw for his encouragement and support in writing this article. |