[理工] 線代
T/F
假設A,B兩個矩陣分別是 n*k , k*m,如果A,B皆為行獨立,
則AB也為行獨立
我自己這樣想的
rank(A)=k,可得 k <= n
rank(B)=m,可得 m <= k
--> m <= k <= n
rank(AB)<=min{n,m}
又因為m<=n
所以rank(AB)<=m
接下來就不知道了QQ
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