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7.81

证 ： 设 G={ , ,… , }, 指定 G 中任一元 ，任意 ∈ G ， ： → ，则 是 G 上的一个置换，即以 G 为目标集。 = ， G 的右正则表示 f ： → = 。 f 是单射： ≠ ，则 ≠ f( )=                            = ＝ f( )f( ) 　证毕。. 返回.

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7.81

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  1. 证： 设G={ , ,… , },指定G中任一元 ，任意 ∈G， ： → ，则 是G上的一个置换，即以G为目标集。 = ，G的右正则表示f： → = 。f是单射： ≠ ，则 ≠ f( )=                            = ＝f( )f( )　证毕。 返回

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