[Merged by Bors] - feat(data/polynomial/algebra_map): aeval_tower #9250
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…lynomials (#8116) This adds an `AlgHom` version of `eval₂RingHom'`, and a stronger ext lemma for noncommutative algebras. This is a follow-up to leanprover-community/mathlib#9250 This better ext lemma golfs away most of a nasty proof.
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…lynomials (#8116) This adds an `AlgHom` version of `eval₂RingHom'`, and a stronger ext lemma for noncommutative algebras. This is a follow-up to leanprover-community/mathlib#9250 This better ext lemma golfs away most of a nasty proof.
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aeval_toweris for defining alg_homs out ofpolynomial Rover a smaller base ring thanR. I also added an extra extensionality lemma for alg homs. It comes above the currentalg_hom_extso it has lower priority.