[線代] 一題矩陣性質
(一)
設A為n階方陣
若A^8 = A 請問是否可以肯定 A^2 = A ?
(二)
證明 tr [B^(-1) A B] = tr(A) , 其中A B為同階方陣 且B^(-1) 存在
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