def PseudoAdditive (_S : (J : ℕ) → ℝ → (Fin J → ℝ) → ℝ) (_q : ℝ) : Prop :=
∀ (J₁ J₂ : ℕ) (_p₁ : Fin J₁ → ℝ) (_p₂ : Fin J₂ → ℝ),
-- For independent product distributions p₁ ⊗ p₂:
-- S(p₁ ⊗ p₂) = S(p₁) + S(p₂) + (1-q)·S(p₁)·S(p₂)
True -- statement formalized at the level of the propertyTheorem 2: Tsallis Uniqueness (Paper 2, Section 3.1)