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如何证明若其中一个矩阵可对角化,则另一个也可对角化?
本题的几何背景可参考 @蓝金 的回答。不过,有个小细节需要更正一下。若设二维复线性空间 V的一组基为 \{e_1,e_2\},V 上的线性变换 \varphi 在这组基下的表示矩阵为 A=\begin{pmatrix} a & b \\ c & d \\ \end{pmatrix} ,则 \mathrm{Sym}^2(V) 的一组基为 ...
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