English
With suitable algebra structure, aeval commutes with bind₂ in the stated way.
Русский
При наличии необходимой алгебраической структуры aeval commute с bind₂ в указанном виде.
LaTeX
$$$$ \mathrm{aeval}\, f\, (\mathrm{bind}_2\, g\, \varphi) = \mathrm{eval}_2\mathrm{Hom}\, ((\uparrow(\mathrm{aeval}\, f) : _ →ₐ[S] _ ) \circ g)\, f\, \varphi $$$$
Lean4
theorem aeval_bind₂ [Algebra S T] (f : σ → T) (g : R →+* MvPolynomial σ S) (φ : MvPolynomial σ R) :
aeval f (bind₂ g φ) = eval₂Hom ((↑(aeval f : _ →ₐ[S] _) : _ →+* _).comp g) f φ :=
eval₂Hom_bind₂ _ _ _ _