6.5 Problems
Problem 1. Compute the eigenvalues of the matrices
and find an eigenvector for every eigenvalue.
Problem 2. Let A ∈ℝn×n be an upper or lower triangular matrix. Show that the eigenvalues of A are its diagonal elements.
Problem 3. Let A ∈ℝn×n be a square matrix. Show that
is a polynomial of degree n in λ.
This is the characteristic polynomial that we have talked about, and we have even mentioned this fact. However, we omitted the proof, so here’s your chance to fill the gap.
Problem 4. Let A ∈ℝn×n, B ∈ℝn×m, and C ∈ℝm×m arbitrary matrices, and we define the so-called block matrix
Show that if λ is an eigenvalue of A or an eigenvalue of B, then it’s also an eigenvalue of C.
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