IsGLB.union

∀ {γ : Type u_3} [inst : SemilatticeInf γ] {a b : γ} {s t : Set γ}, IsGLB s a → IsGLB t b → IsGLB (s ∪ t) (a ⊓ b)

If a is the greatest lower bound of s and b is the greatest lower bound of t, then a ⊓ b is the greatest lower bound of s ∪ t.

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