English
The pair upperPolar and lowerPolar forms a Galois connection under the appropriate dualities.
Русский
Пара upperPolar и lowerPolar образуют связь Галуа при соответствующих двойственностях.
LaTeX
$$$\mathrm{GaloisConnection}(\mathrm{toDual} \circ \mathrm{upperPolar}(r), \mathrm{lowerPolar}(r) \circ \mathrm{ofDual})$$$
Lean4
theorem gc_upperPolar_lowerPolar : GaloisConnection (toDual ∘ upperPolar r) (lowerPolar r ∘ ofDual) := fun _ _ =>
subset_upperPolar_iff_subset_lowerPolar