proposition: Fact split_andb (a b : bool) : a -> b -> a && b.
proof: Proof. by move=> pa pb; apply/andP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path) mathcomp(ssralg fintype perm choice matrix bigop zmodp mxalgebra poly) ssrcomplements stronglydiscrete coherent edr