試題詳解

Let A be an m x n matrix whose null space has dimension k. Which conclusion is correct?
(A) The dimension of Null(A^T) is k.
(B) The dimension of row space of A is m-k.
(C) The dimension of column space of A is m-k.
(D) The dimension of row space of A'is n-k.
(E) The dimension of column space of A is n-k.