[Merged by Bors] - refactor(Algebra/Module/LinearMap): generalize the endomorphism algebra instance #6207
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…ra instance This also moves some lemmas about `IsUnit (_ : Module.End R M)` to an earlier file as they are nothing to do with `Algebra`.
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…ra instance (#6207) Note that the module instance was already generalized; we were just missing the fact that when combined with the existing ring instance, the result was an algebra. This also moves some lemmas about `IsUnit (_ : Module.End R M)` to an earlier file as they are nothing to do with `Algebra`.
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…ra instance (#6207) Note that the module instance was already generalized; we were just missing the fact that when combined with the existing ring instance, the result was an algebra. This also moves some lemmas about `IsUnit (_ : Module.End R M)` to an earlier file as they are nothing to do with `Algebra`.
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…ra instance (#6207) Note that the module instance was already generalized; we were just missing the fact that when combined with the existing ring instance, the result was an algebra. This also moves some lemmas about `IsUnit (_ : Module.End R M)` to an earlier file as they are nothing to do with `Algebra`.
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Note that the module instance was already generalized; we were just missing the fact that when combined with the existing ring instance, the result was an algebra.
This also moves some lemmas about
IsUnit (_ : Module.End R M)to an earlier file as they are nothing to do withAlgebra.