proposition: Lemma F_alpha_0_eq (alpha : E0): F_ alpha 0 = 1.
proof: Proof. by rewrite /F_ F_alpha_0_eq. Qed.
imports: mathcomp(all_ssreflect zify) Coq(Logic.Eqdep_dec Arith) hydras(DecPreOrder) hydras(T1 E0) hydras(primRec) hydras(F_alpha F_omega) gaia_hydras(T1Bridge GCanon GHprime)