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如果a是AB的非零特徵值,則存在非零向量x,使得ABx=ax **. 而Bx不等於零,否則若Bx=0有ax=0,與a非零和x非零衝突. 記:Bx=y. 由**左乘B,可知BAy=ay.因y為非零向量,所以a也是BA的特徵值. 同理,BA的非零特徵值也是AB的特徵值. 即得證結論.
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