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[Merged by Bors] - chore(Algebra): generalize subalgebra operations to semirings #30250

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[Merged by Bors] - chore(Algebra): generalize subalgebra operations to semirings #30250

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4 changes: 2 additions & 2 deletions Mathlib/Algebra/Algebra/Subalgebra/Operations.lean
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Expand Up @@ -31,7 +31,7 @@ namespace Subalgebra

open Algebra

variable {R S : Type*} [CommSemiring R] [CommRing S] [Algebra R S]
variable {R S : Type*} [CommSemiring R] [CommSemiring S] [Algebra R S]
variable (S' : Subalgebra R S)

/-- Suppose we are given `∑ i, lᵢ * sᵢ = 1` ∈ `S`, and `S'` a subalgebra of `S` that contains
Expand Down Expand Up @@ -75,7 +75,7 @@ end Subalgebra

section MulSemiringAction

variable (A B : Type*) [CommRing A] [CommRing B] [Algebra A B]
variable (A B : Type*) [CommSemiring A] [Ring B] [Algebra A B]
variable (G : Type*) [Monoid G] [MulSemiringAction G B] [SMulCommClass G A B]

/-- The set of fixed points under a group action, as a subring. -/
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