G是个群,H和K都是G的不变子群,且H∩K={e},那么对任意的x属于H,y属于K,恒有xy=yx.
G是个群,H和K都是G的不变子群,且H∩K={e},那么对任意的x属于H,y属于K,恒有xy=yx.
数学人气：866 ℃时间：2020-05-09 00:47:13
优质解答
xyx^-1y^-1属于H和k,所以有xy=yx.
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