English
The restriction map from the automorphism group of E to that of K₁ is surjective.
Русский
Отображение ограничения из автоморфизмов E на K₁ образует сюръективное отображение.
LaTeX
$$Function.Surjective (AlgEquiv.restrictNormalHom K₁ : (E ≃ₐ[F] E) → K₁ ≃ₐ[F] K₁)$$
Lean4
@[simp]
theorem liftNormal_commutes [Normal F E] (x : K₁) : ϕ.liftNormal E (algebraMap K₁ E x) = algebraMap K₂ E (ϕ x) :=
-- We have to specify one `Algebra` instance by unification, not synthesis.
@AlgHom.commutes K₁ E E _ _ _ _ (_) _ _