fact: Definition rcs_perm n : {perm 'I_n} := if n is n.+1 then Perm (rcs_perm_ffun_injectiveb n) else 1.
imports: mathcomp(all_ssreflect ssralg poly polydiv fingroup perm) mathcomp(finalg zmodp matrix mxalgebra mxpoly polydiv vector) ssralg_ext poly_ext f2 hamming linearcode dft