def AxiomA3_Symmetry (Φ : (Fin J → ℝ) → (Fin J → ℝ) → ℝ) : Prop := ∀ (ε : Fin J → ℝ) (σ : Equiv.Perm (Fin J)), (∀ j, ε (σ j) = ε j) → ∀ p : Fin J → ℝ, Φ (p ∘ σ) ε = Φ p ε
thesis/CESProofs/Potential/CESPotential.lean:49
Theorem 3: CES Potential Uniqueness (Paper 2, Section 3.2)