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※ 引述《ruby791104 (阿年:))》之銘言: : 1.Show that the eigenvalues of a triangular matrix are the diagonal elements : of the matrix A=[aij] ,aij=0 when i<j or when i>j n det(A-kI)=Π(aii-k)=0 i=1 ->k=aii ,i=1,2,...,n : 2.Let A be an n*n matrix. Prove that A is singular if and only if λ = 0 is : an eigenvalue of A. 1. n det(A)=Πλi , det(A)=0 <=> 存在一λ=0 i=1 : 可以教我一下怎麼做嗎? : 麻煩各位好心的大大了(鞠躬 -- I seek not to know only answers, but to understand the questions. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.193.214.165 ※ 編輯: iyenn 來自: 123.193.214.165 (04/01 23:05)
ruby791104:謝謝i大,我去研究看看!真的很謝謝你,而且動作好快XD 04/02 00:07