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Continuity of the phase transition for planar random-cluster and Potts models with 1 <= q <= 4 (Theorems 1, 2 and 3)

Zijie Zhuang

Palomar Registrypalomar/PALOMAR-2026-10-22-000019Oct 22, 2026math.PRscore 0

A complete Lean 4 / Mathlib formalization of Theorems 1, 2 and 3 of Duminil-Copin, Sidoravicius and Tassion (arXiv:1505.04159v1). Theorem 3: for the random-cluster model on the square lattice with any real cluster weight q >= 1, at its critical point p_c, the following are equivalent: the origin lies in an infinite cluster with probability 0 under the wired measure; equality of the free and wired measures; infinite susceptibility of the free measure; sub-exponential decay of the free one-arm probability; and the RSW bound for free boundary conditions at distance n. Theorem 2: for 1 = 1…

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