If we know that the fourth-order square matrix A is similar to B, and the eigenvalues of a are 2,3,4,5, then | B-I | =? (where I is the fourth-order identity matrix) Why is the eigenvalue of B-I 2-1,3-1,4-1,5-1, that is: 1,2,3,4

If we know that the fourth-order square matrix A is similar to B, and the eigenvalues of a are 2,3,4,5, then | B-I | =? (where I is the fourth-order identity matrix) Why is the eigenvalue of B-I 2-1,3-1,4-1,5-1, that is: 1,2,3,4


If the eigenvalue of similarity matrix is the same, (B-I) β = B β - I β = λ β - β = (λ - 1) β, then the eigenvalue of B-I is λ - 1