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I recall, I think, that there is a lemma wich states that a 2x2 symmetric matrix can be diagonalized so that its eigenvalues are (trace) and 0.

I can not find it anywhere =/ I think it was a physics teacher who told us this a couple of years ago, can anyone enlighten me?

cheers

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# Eigenvalues and eigenvectors of symmetric 2x2 matrix?

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