fact: Definition L3tool m (c: 'cV[R]_m) (d: R) (i: 'I_(1 + m)) := if split i is inr j then c j 0 else d.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path) mathcomp(ssralg fintype perm choice) mathcomp(matrix bigop zmodp mxalgebra poly polydiv mxpoly) ssrcomplements dvdring minor atomic_operations