An Normal subgroup of Sn? why??
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Originally Posted by cvcv49 An Normal subgroup of Sn? why?? Proof 1: because $\displaystyle [S_n:A_n]=2$ ; Proof 2: because $\displaystyle \pi^{-1}\sigma\pi\in A_n\,\,\,\forall\,\pi\in S_n\,\,\forall \sigma\in A_n$ Tonio
And also a trivial one and $\displaystyle S_n$ itself
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