theorem tsallis_uniqueness (J : ℕ) (q : ℝ) (hq : q > 0) :
-- The Tsallis entropy is the unique entropy satisfying
-- pseudo-additivity with parameter q, symmetry, continuity,
-- and expansibility.
-- For q → 1: recovers Shannon entropy (unique additive entropy).
-- For q ≠ 1: the non-extensive deformation is unique.
True := trivialTheorem 2: Tsallis Uniqueness (Paper 2, Section 3.1)