proposition: Lemma hzqrand0eq ( p : hz ) ( x : hzneq 0 p ) : 0 = ( p * 0 ) + 0.
proof: Proof. intros. rewrite hzmultx0. rewrite hzplusl0. apply idpath. Defined.
imports: UniMath.PAdics.lemmas UniMath.NumberSystems.Integers UniMath.Foundations.Preamble