fact: Definition L_ (alpha:E0) (i:nat): nat := L_alpha.L_ (E0_g2h alpha) i.
imports: mathcomp(all_ssreflect zify) Coq(Logic.Eqdep_dec) hydras(DecPreOrder) hydras(T1 E0) hydras(L_alpha) gaia_hydras(T1Bridge GCanon GPaths GHprime)