LowerSet.sdiff_sup_lowerClosure

∀ {α : Type u_1} [inst : Preorder α] {s : LowerSet α} {t : Set α},
  t ⊆ ↑s → (∀ b ∈ s, ∀ c ∈ t, c ≤ b → b ∈ t) → s.sdiff t ⊔ lowerClosure t = s

Defined in: Mathlib.Order.UpperLower.Closure
Cited by: 2 results in Mathlib
Foundations: Depth 63 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: Preorder

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