[線代] 對稱矩陣證明
我遇到一個對稱矩陣的證明
結果看起來很合理
但是我不知道該怎麼證明
n*n對稱矩陣A,已知其對角線元素為不為零的數λ_1,λ_2,...λ_n
其逆矩陣A^-1的對角線元素為1/λ_1, 1/λ_2,...1/λ_n
證明A的非對角線元素皆為0
這個結果好像很理所當然
可是我不知道怎麼證......
拜託強者幫忙解答
萬分感謝
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