Let AAA be a 2×22 \times 22×2 matrix with eigenvalues λ1=2,λ2=3\lambda_1 = 2, \lambda_2 = 3λ1=2,λ2=3. What are the eigenvalues of (A−I)−1(A-I)^{-1}(A−I)−1?
1,121, \frac{1}{2}1,21
12,1\frac{1}{2}, 121,1
1,21, 21,2
−1,−2-1, -2−1,−2