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Jan 1, 2020 at 18:25 history edited loup blanc CC BY-SA 4.0
added 2 characters in body
Jan 1, 2020 at 18:24 comment added loup blanc No, $\phi$ is an endomorphism of $M_n$. cf. Kronecker product.
Jan 1, 2020 at 18:02 comment added Jiro Is P missing in the definition of $\phi$?
Jan 1, 2020 at 17:05 history answered loup blanc CC BY-SA 4.0