English
There is a Galois connection between the coercion and interior: (↑) ⊣ interior.
Русский
Существует галуазова связь между коэрцией и interior: (↑) ⊣ interior.
LaTeX
$$$\mathrm{gc} : \mathrm{GaloisConnection}( (↑): \mathrm{Opens}(\alpha) \to \mathcal{P}(\alpha), \mathrm{Opens.interior})$$$
Lean4
theorem gc : GaloisConnection ((↑) : Opens α → Set α) Opens.interior := fun U _ =>
⟨fun h => interior_maximal h U.isOpen, fun h => le_trans h interior_subset⟩