IsLeast.union

∀ {γ : Type u_3} [inst : LinearOrder γ] {a b : γ} {s t : Set γ}, IsLeast s a → IsLeast t b → IsLeast (s ∪ t) (min a b)

If a is the least element of s and b is the least element of t, then min a b is the least element of s ∪ t.

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