An Normal subgroup of Sn?

why??

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- May 4th 2010, 08:34 AMcvcv49Normal subgroup
An Normal subgroup of Sn?

why?? - May 4th 2010, 08:37 AMtonio
- May 6th 2010, 07:36 AMFancyMouse
And also a trivial one and $\displaystyle S_n$ itself