fact: Definition nat_of_cV n (y : 'cV['F_2]_n) : nat := nat_of_rV y^T.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype tuple) BinPos BinNat PArith ssr_ext mathcomp(bigop zmodp ssralg matrix) ssralg_ext f2