∀ {R : Type u_1} {M : Type u_2} {A : Type u_4} {B : Type u_5} [inst : CommSemiring R] [inst_1 : CommSemiring A]
  [inst_2 : CommSemiring B] [inst_3 : Algebra R A] [inst_4 : Algebra R B] [inst_5 : CommMonoid M] (a : A) (m : M)
  (b : B), MonoidAlgebra.tensorEquiv.invFun (MonoidAlgebra.single m (a ⊗ₜ[R] b)) = a ⊗ₜ[R] MonoidAlgebra.single m b