原帖由 noski 于 2008-3-12 00:43 发表![]()
For Rubik’s cube, we desire a subgroup of 48 automorphisms that preserve the set of generators: the natural automorphisms of Rubik’s cube. Each automorphism can be identified with a symmetry of a geometric cube: either one of 24 rotations of the entire cube or a rotation followed by an inversion of the cube. An inversion of the cube maps each corner of the cube to the opposite corner. 这段可能很让人感兴趣,为了减少计算量,减少计算时间,引入了48 automorphisms,48自同构,48同态。。其中的24个是由于整体翻转得到的,再加上inversion的24个。至于是怎么倒转过来了还未弄清楚,不过感觉和g大师的似同非同。
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