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設a為矩陣A的特徵值,X為對應的非零特徵向量. 則有AX = aX. aX = AX = A^2X = A(AX)= A(aX)= aAX = a(aX)= a^2X, (a^2 - a)X = 0, 因X為非零向量,所以. 0 = a^2 - a = a(a-1), a = 0或1.
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