English
If E is separable over F and f: E →ₐ[F] E' is an algebra homomorphism, then E' inherits separability from E.
Русский
Если E разделимо над F, и f: E →ₐ[F] E' — алгебраический гомоморфизм, то E' наследует разделяемость от E.
LaTeX
$$theorem of_algHom [Algebra.IsSeparable F E'] : Algebra.IsSeparable F E := ⟨fun x => (Algebra.IsSeparable.isSeparable F (f x)).of_algHom⟩$$
Lean4
theorem of_algHom [Algebra.IsSeparable F E'] : Algebra.IsSeparable F E :=
⟨fun x => (Algebra.IsSeparable.isSeparable F (f x)).of_algHom⟩