proposition: Lemma T1nf_finite1 n b: T1nf (cons zero n b) = (b == zero).
proof: Proof. by case: b => // a n' b /=; rewrite !T1ltn0 !if_same andbF. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(fintype bigop)