fact: Definition invmor (phi : 'Iso(M,N)) := projT1 (sigW (isoP phi (split_andb (kernel_eq0 [Mono of phi]) (coker_eq0 [Epi of phi])))).
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