fact: Definition eqmor (phi psi : 'Mor(M,N)) := pres N %| phi%:m - psi%:m.
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