proposition: Lemma DP_raise_inj v1 v2: (DP_raise v1 == DP_raise v2) = (v1 == v2).
proof: Proof. by rewrite /DP_raise /= eqseq_cons eqseq_rcons !eqxx /= andbT. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype) mathcomp(ssrnat seq path div) mathcomp(fintype tuple finfun bigop finset binomial)