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布尔巴基分序结构，拓朴结构，代数结构，
可群算代数结构，格群是混合结构？交叉？ http://www.d.umn.edu/~jgallian/ 中心和中心化子图： 中心是对群说的，中心化子是对群元素说的 Permutation group d4 acting on a set of cardinality 4 Order = 8 = 2^3 (1, 2, 3, 4) (1, 4)(2, 3) Permutation group p acting on a set of cardinality 8 (1, 2, 5, 6)(3, 4, 7, 8) (1, 3, 5, 7)(2, 8, 6, 4) GSet{@ 1, 2, 3, 4 @} GSet{@ 1, 2, 3, 4, 5, 6, 7, 8 @} 8 8 Mapping from: GrpPerm: d4 to { 1 .. 8 } Mapping from: GrpPerm: p to { 1 .. 8 } Id(d4) Id(p)   |
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