Theorem: LO.FirstOrder.Arith.Model.not_mem_under_self (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
i : M
⊢ i ∉ under i
Tactic:
simp
State after:
no goals