• 2022-06-26
    设\(A\)为\(m \times n\)矩阵, \(r(A) = r\). \(A^+\)是\(A\)的伪逆,则
    A: \(AA^+ = \begin{pmatrix}I_r&0\\0&0\end{pmatrix}_{m \times m}\)
    B: \(A^+A = \begin{pmatrix}I_r&0\\0&0\end{pmatrix}_{n \times n}\)
    C: \(AA^+|_{C(A)} = Id\)
    D: \(A^+A|_{C(A)} = Id\)
  • 举一反三