English
The surjectivity of algebraMap k K follows from the bijectivity of algebraMap k K in the integral case.
Русский
Суръективность алгебраической карты следует из биективности в интегральном случае.
LaTeX
$$$\forall {k K} [\mathrm{Field}\;k] [\mathrm{CommRing}\;K] [IsDomain K] [IsAlgClosed k] (f : k \to+* K),\; f.IsIntegral \rightarrow Function.Surjective (algebraMap k K)$$$
Lean4
theorem lift_def : eta_helper Eq✝ @lift.{} @(delta% @definition✝) :=
by
intros
delta lift
rw [show wrapped✝ = ⟨@definition✝.{}, rfl✝⟩ from Subtype.ext✝ wrapped✝.2.symm✝]
rfl