English
Closure and inclusion form a Galois insertion between Set(K) and Subfield(K).
Русский
Замыкание и включение образуют вставку Галоиса между множеством(K) и подпольем(K).
LaTeX
$$$\text{closure} \dashv \text{incl}$$$
Lean4
/-- `closure` forms a Galois insertion with the coercion to set. -/
protected def gi : GaloisInsertion (@closure K _) (↑)
where
choice s _ := closure s
gc _ _ := closure_le
le_l_u _ := subset_closure
choice_eq _ _ := rfl