作者pollow (黄先生)
看板Math
标题Re: [线代] 线代(11)
时间Tue Aug 23 18:06:28 2005
※ 引述《PttFund (批踢踢基金只进不出)》之铭言：
: Let A be an m╳n real matrix, and let A' be the transpose of A.
: (a) Show that if m = 2 and n = 4, then the determinant of A'A = 0.
rank(A'A) ≦rank(A)≦m(=2) < n(=4)
=>A'A is not invertable
=> det(A'A) = 0
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