If the eigenvalues of two matrices are known is there any (generalized) way to tell the eigenvalues of the sum of the two matrices? I have come to hear that no such theorem exists that can handle the general case. I want to ask if it is possible to find and prove such a theorem. If yes, what background in linear algebra is required for it?
2026-03-26 01:29:01.1774488541
Finding eigenvalues of the sum of two matrices.
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