English
The left and right tensor maps commute with scalar towers and preserve algebra structure.
Русский
Левые и правые тензорные отображения сохраняют структуру скаляров и алгебраическую структуру.
LaTeX
$$lmul''_toLinearEquiv := ...$$
Lean4
/-- `LinearMap.mul'` as an `AlgHom` over the algebra. -/
def lmul'' : S ⊗[R] S →ₐ[S] S :=
algHomOfLinearMapTensorProduct
{ __ := LinearMap.mul' R S
map_smul' := fun s x ↦
x.induction_on (by simp) (fun _ _ ↦ by simp [TensorProduct.smul_tmul', mul_assoc]) fun x y hx hy ↦ by
simp_all [mul_add] }
(fun a₁ a₂ b₁ b₂ => by simp [mul_mul_mul_comm]) <|
by simp