Theorem: LO.FirstOrder.Arith.Model.one_eq_singleton (Arithmetization/ISigmaOne/Bit.lean)

State before:
M : Type u_1
inst✝⁵ : Zero M
inst✝⁴ : One M
inst✝³ : Add M
inst✝² : Mul M
inst✝¹ : LT M
inst✝ : M ⊧ₘ* 𝐈𝚺₁
⊢ 1 = {∅}
Tactic:
simp [singleton_eq_insert, insert, bitInsert, emptyset_def]
State after:
no goals