Theorem: LO.FirstOrder.Arith.Model.pow_four_eq_sq_sq (Arithmetization/Vorspiel/Lemmata.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* 𝐏𝐀⁻
a b c x : M
⊢ x ^ 4 = (x ^ 2) ^ 2
Tactic:
simp [pow_four, sq, mul_assoc]
State after:
no goals