Theorem: LO.FirstOrder.Arith.Model.Exponential.ext_append_last (Arithmetization/ISigmaZero/Exponential/Exp.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* 𝐈𝚫₀
i X z : M
hz : z < i
⊢ ext i (append i X z) = z
Tactic:
simp [ext, append, div_add_mul_self, show 0 < i from pos_of_gt hz, hz]
State after:
no goals