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λ1[p1,p2]
= [λ1p1,p2]
= [Ap1,p2]
= (Ap1)^Tp2
= p1^TA^Tp2
= p1^TAp2 --A是对称矩阵
= p1^Tλ2p2
= λ2[p1,p2]
所以 (λ1-λ2)[p1,p2] = 0
因为 λ1≠λ2
所以 [p1,p2] = 0
= [λ1p1,p2]
= [Ap1,p2]
= (Ap1)^Tp2
= p1^TA^Tp2
= p1^TAp2 --A是对称矩阵
= p1^Tλ2p2
= λ2[p1,p2]
所以 (λ1-λ2)[p1,p2] = 0
因为 λ1≠λ2
所以 [p1,p2] = 0
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