※ 引述《PttFund (批踢踢基金只進不出)》之銘言:
: 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
--
霹靂動物園 活力‧奮鬥不懈
PZ_Cute 懷抱 Σ可愛動物區 無尾熊有我可愛嗎?
Pollow 笨兔 ◎遺忘在古都的情懷
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.113.94.36