English
Definition: turning a subfield of L into an intermediate field of K and L by requiring that it contains the image of K.
Русский
Определение: превращение подполе L в промежуточное поле K–L с условием, что образ K содержится в этом подполе.
LaTeX
$$$\\text{toIntermediateField}(S) = \\{ S \\text{ with } \\ algebraMapK L \\xrightarrow{ } S \\}$$$
Lean4
/-- Turn a subfield of `L` containing the image of `K` into an intermediate field. -/
def toIntermediateField (S : Subfield L) (algebra_map_mem : ∀ x, algebraMap K L x ∈ S) : IntermediateField K L :=
{ S with algebraMap_mem' := algebra_map_mem }