Registry · Theorem
IV.T209
tau-effective
formalized
IV.T209 — Curie Transition as T² Symmetry Breaking
Curie transition = 2nd-order phase transition in defect-tuple framework. Order parameter φ = ⟨M⟩/M_sat = global d₄ coherence. Z₂ broken below T_C. Susceptibility diverges at T_C. Universality class from T² symmetry.