[Merged by Bors] - feat(representation_theory/Rep): describe monoidal closed structure #18148
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This PR seems to be quite some achievement! It seems to me that the long simp blocks are just a feature of category theory in Lean sometimes. I think that it would be helpful if you added either some comments or docstrings or both, because there's a lot going on here and it seems to be known to the experts how these things work, but not to me :-)
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…18148) The monoidal closed structure on `Rep k G` defines an internal hom of representations; we show this agrees with `representation.lin_hom`. Moreover, the maps defining the hom-set bijection come from the tensor-hom adjunction for $k$-modules.
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The monoidal closed structure on$k$ -modules.
Rep k Gdefines an internal hom of representations; we show this agrees withrepresentation.lin_hom. Moreover, the maps defining the hom-set bijection come from the tensor-hom adjunction for