Pi.constAlgHom

(R : Type u_2) →
  [inst : CommSemiring R] →
    (A : Type u_5) → (B : Type u_6) → [inst_1 : Semiring B] → [inst_2 : Algebra R B] → B →ₐ[R] A → B

Function.const as an AlgHom. The name matches Pi.constRingHom, Pi.constMonoidHom, etc.

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