fact: Definition bmember n (x : R) (I : 'cV[R]_n) := match x %/? principal_gen I with | Some a => Some (a %:M *m principal_w1 I) | None => None end.
imports: HB(structures) Coq(ssreflect ssrfun ssrbool Arith.Wf_nat) mathcomp(eqtype ssrnat div seq path) mathcomp(ssralg fintype perm tuple choice generic_quotient) mathcomp(matrix bigop zmodp mxalgebra poly) stronglydiscrete