fact: Definition plus2 (h1 h2 : heap * heap) : heap * heap := (h1.1 :+ h2.1, h1.2 :+ h2.2).
imports: mathcomp(ssreflect ssrfun ssrnat div ssrbool seq) LemmaOverloading(prelude finmap ordtype) mathcomp(path eqtype) Eqdep