proposition: Lemma size_tail_poly {R: ringType} (q: {poly R}): size (tail_poly q) = (size q).-1.
proof: Proof. rewrite /tail_poly. case: q => [[|a s] /= Hs]. - by rewrite polyseq0. - by rewrite (PolyK Hs). Qed.
imports: Relational(OrderEnrichedCategory GenericRulesSimple) mathcomp(all_ssreflect all_algebra reals distr realsum ssrnat ssreflect ssrfun ssrbool ssrnum eqtype choice seq) Mon(SPropBase) Crypt(Axioms ChoiceAsOrd SubDistr Couplings UniformDistrLemmas FreeProbProg Theta_dens RulesStateProb pkg_core_definition choice_type pkg_composition pkg_rhl Package Prelude) extructures(ord fset fmap) Equations(Equations)