Theorem: LO.FirstOrder.Semiformula.Operator.LT.open (Logic/FirstOrder/Basic/Operator.lean)

State before:
L✝ : Language
L : Language
inst✝¹ : L.Eq
inst✝ : L.LT
ξ : Type u_1
n : ℕ
t u : Semiterm L ξ n
⊢ (op(<).operator ![t, u]).Open
Tactic:
simp [Operator.operator, Operator.LT.sentence_eq]
State after:
no goals