Frobenius Theorem 1897

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Where can I find the proof of Frobenius's theorem in 1897 about linear transformation from the complex nxn matrices preserving the determinant?

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Look at M. Marcus, B. Moyls, Linear Transformations on Algebras of Matrices, Canadian Journal of Mathematics, 1959. Try to reach out to V. Troitsky (Calgary or U of Alberta)... He had a nice proof which presumably he'd adapted from Marcus and Moyls.