proposition: Lemma fdistC12I : fdistC12 (fdistC12 P) = P.
proof: Proof. rewrite /fdistC12 fdistmap_comp (_ : _ \o _ = ssrfun.id) ?fdistmap_id //. by rewrite boolp.funeqE => -[[]]. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup perm matrix) mathcomp(all_algebra vector reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(Rstruct) ssrR logb realType_ext ssr_ext ssralg_ext bigop_ext