[Everyday Mathematics]20150218
2015-01-21 21:03
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设 $A,B$ 是 $n$ 阶复方阵, 适合 $$\bex A^2B+BA^2=2ABA. \eex$$ 试证: 存在 $k\in\bbZ^+$, 使得 $(AB-BA)^k=0$.
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