[理工] 線代 冪零矩陣
A為一冪零矩陣
如果A^k=0
試證I-A為nonsingular matrix
解法是
I-A^k=I=(I-A)(I+A+A^2+...+A^K-1)
用後面兩式來看的話
變成I=(I-A)(I+A+A^2+...+A^K-1)
可是我想不太通為什麼I+A+A^2+...可以直接inverse到左邊
使其變成I-A的反矩陣
I+A+A^2+...為什麼一定是滿秩的呢?
問題有點奇怪..煩請解答..謝謝
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