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bugal402 let A be an m x n matrix...prove that N(A^T*A)=N(A) problem gives a hint vector x is a member of N(A^T*A) then A*vector x is a member of C(A) n N(A^T)
B) prove that rank (A)=rank(A^T*A)
C) prove that C(A^T*A)=C(A^T)
Thanks