proposition: Fact kernelK (M N : {fpmod R}) (phi : 'Mor(M,N)) : kernel (kernel phi) %= 0.
proof: Proof. by rewrite kernel_eq0. Qed.
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