English
If f : k →+* K is integral, then f is bijective.
Русский
Если кольцо отображает f : k →+* K интегрально, то оно биективно.
LaTeX
$$$\forall {k K} [\mathrm{Field\;k}] [\mathrm{CommRing}\;K] [\mathrm{IsDomain}\;K] [IsAlgClosed k] (f : k \to+* K) (hf : f.IsIntegral),\; Function.Bijective f$$$
Lean4
/-- A (random) homomorphism from an algebraic extension of R into an algebraically
closed extension of R. -/
noncomputable def lift :=
val_proj @wrapped✝.{}