proposition: Fact add0m_subproof : left_id zeromor addmor.
proof: Proof. by move=> x; apply: val_inj; apply: add0r. 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