Certificates / CONCEPT

Chapoton and Han Conjecture 5.4 printed formula refutation

Refutes only printed equation 5.5, Conjecture 5.4 in arXiv:2001.01449v1, at n = 2; literature-attested, new_counterexample_claimed = false. No claim that the authors' intended proposition is false or its proof has a gap; the corrected version proved in later literature is outside scope. No verdict on Proposition 5.2. No priority is claimed for the determinant value or identification of this off-by-one.