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Answers for “这个重新索引恒等式如何用于证明平均内积的不变性?”

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For a finite group GG, multiplying every element on the right by a fixed element h∈Gh \in G merely permutes the elements of GG. The set {gh∣g∈G}\{gh \mid g \in G\} is exactly GG.

Conditions: GG is a finite group.; hh is a fixed element in GG.; ff is any function defined on GG.