proposition: Lemma bin_invert_exp2n n: bin_invert (2^n) = 2^n.
proof: Proof. by elim: n => //n Hrec; rewrite expn2S bin_invert_double Hrec. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq choice fintype order bigop ssralg) mathcomp(div ssrnum ssrint rat prime path binomial) mathcomp(tuple finset) gaia(fibm)