Lemma isdecrelhzeqi (i : hz) : isdecrelhzeq i i = ii1 (idpath _). Proof. induction (isdecrelhzeq i i) as [T | F]. - apply maponpaths. apply isasethz. - apply fromempty. apply F. apply idpath. Qed.
Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.Algebra.Monoids. Require Import UniMath.Algebra.Groups.