※ 引述《ruby791104 (阿年：）)》之铭言： : 1.Use mathematical induction to prove that if A is an (n+1) ×(n+1) matrix : with two identical rows then det(A) = 0 Case n=0 is trivial. If it is true for n×n matrix, then for (n+1) ×(n+1) matrix, we can use raw expansion with respect to some raw not any one of two identical rows given. By the assumption, every term is 0. QED. : 以上，麻烦好心的大大！（鞠躬 --

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