proposition: Lemma L_zeroE i : L_ E0zero i = i.
proof: Proof. by rewrite /L_. Qed.
imports: mathcomp(all_ssreflect zify) Coq(Logic.Eqdep_dec) hydras(DecPreOrder) hydras(T1 E0) hydras(L_alpha) gaia_hydras(T1Bridge GCanon GPaths GHprime)