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I am trying to find the eigenvalues of a characteristic equation in Python, the problem is that in the equation |A-lambda I|=0, the matrix that multiplies lambda isn't the identity matrix, but I have to make clear that this matrix different to the identity matrix is a diagonal matrix.

Jatentaki
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The problem you're facing is known as the generalized eigenvalue problem. An example solution with numpy is given in this question.

Jatentaki
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