Which of the following statements are correct? a) A square matrix A is not invertible if and only if A = 0 is an eigenvalue of A. b) If v1 and v2 are linearly independent eigenvectors of a matrix A, then they correspond to different eigenvalues. c) If a square matrix A is triangular, then the eigenvalues of A are the entries on its main diagonal. -4 d) A= 5 is an eigenvalue of A = 8

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