9.(10%) How many of the following five statements are correct? __________
ㆍThe solution set for a system of homogeneous linear equations having an m x n rational coefficient matrix is a rational vector space.
ㆍAn m x n complex matrix A is invertible if and only if A* is invertible.
ㆍIf A is an m x n rational matrix, then rank(A) = rank(A
t).
ㆍIf A is an m x n invertible real matrix, then nullity(A) = nullity(
).
ㆍIf A is an n X n complex matrix, then
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