习题 24, § 8
标签 065P,永久不变。引用为 [Bourbaki, Tag 065P]。
代数, III, 643
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令 () 为阶 在交换环 A 上的方阵。 证明如果 是偶数则 (习题 23)
如果 是奇数
(If is the cyclic permutation , the cyclic subgroup of generated by and the subgroup of consisting of the permutations leaving invariant, note that every permutation in can be written uniquely as with and ; then use the fact that the trace of a product of matrices is invariant under cyclic permutation of the factors.)
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