English
For a generalized Boolean algebra α, the map x ↦ (x ⊔ u) \\ v is injective on the set { x | Disjoint u x ∧ v ≤ x }. In particular, the injOn property holds for this map.
Русский
Для обобщенного булева алгебра α отображение x ↦ (x ⊔ u) \\ v инъективно на множестве { x | Disjoint u x ∧ v ≤ x }.
LaTeX
$$$\\{x \\mid Disjoint\\ u\\ x \\land v \\le x\\}.InjOn\\bigl( x \\mapsto (x \\lor u) \\setminus v \\bigr)$$$
Lean4
/-- `IsCompressed u v s` expresses that `s` is UV-compressed. -/
def IsCompressed (u v : α) (s : Finset α) :=
𝓒 u v s = s