[理工] [線代]97台大資工
第一個問題是第一部分的第4題
4.If A屬於R^8*7 and rank(A) = 3, then nullity(A^t) = ________
解答是
rank(A) = rank(A^t) = 3
A屬於R^8*7 => A^t屬於R^7*8
因為8 = rank(A^t) + nullity(A^t)
所以nullity(A^t) = 5
想請問的是8的部分,在R^m*n中,不是應該rank(R) = min{m, n}嗎?
為什麼是8不是7?
另外想請問第9和第10題。要解的觀念大概是什麼?
麻煩各位前輩了
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