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eigenvalues of matrices or operators

3 votes
1 answer
293 views

Eigenvalues two-fold degenerate

Consider the matrix $$A:=\left( \begin{array}{cccc} 0 & a & 0 & 0 \\ f & 0 & b & 0 \\ 0 & e & 0 & c \\ 0 & 0 & d & 0 \\ \end{array} \right)$$ I noticed that if I square this matrix then the eigenvalues
António Borges Santos's user avatar
5 votes
2 answers
715 views

Matrices with same eigenvalues

This question is a more precise version of this question. Let's assume we have the matrix $$\left( \begin{array}{ccccc} 0 & a & 0 & 0 & 0 \\ f & 0 & b & 0 & 0 \\ 0 & e & 0 & c & 0 \\ 0 & 0 & d & 0 …
António Borges Santos's user avatar
1 vote
1 answer
126 views

Matrix transformation that always works?

.$$ That there exists one such matrix for each set of coefficients is clear, since the eigenvalues of the two $3x3$ matrices are the same. I am looking for one that works for all choices. …
António Borges Santos's user avatar