English
Finite inseparable degree for the top field matches the base–top relation (variant).
Русский
Конечная неинsep степень для верхнего поля совпадает с базовым отношением (вариант).
LaTeX
$$$ \mathrm{finInsepDegree} F (\top : \text{IntermediateField } E K) = \mathrm{finInsepDegree} F K $$$
Lean4
theorem finInsepDegree_le_of_left_le {E₁ E₂ : IntermediateField F K} (H : E₁ ≤ E₂) [Module.Finite E₁ K] :
finInsepDegree E₂ K ≤ finInsepDegree E₁ K :=
by
letI := (IntermediateField.inclusion H).toAlgebra
have : IsScalarTower E₁ E₂ K := .of_algebraMap_eq' rfl
exact finInsepDegree_top_le_finInsepDegree_of_isScalarTower _ _ _