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Given an

What can I deduce from it. e.g. what does it say about the eigenvalues?

*n*by*n*matrix*M*with complex coefficients such that*M*and^{2}= I*M*is not equal to*I*.What can I deduce from it. e.g. what does it say about the eigenvalues?

*edit: of course M*^{ -1}= M.
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