fact: Example α : T1 := T1omega + phi0 T1omega * \F 3 + phi0 (\F 5) * \F 4 + T1omega * T1omega.
imports: mathcomp(all_ssreflect zify) Coq(Logic.Eqdep_dec) hydras(DecPreOrder ON_Generic) hydras(T1 E0 Hessenberg) gaia_hydras(T1Bridge GCanon GHessenberg GLarge_Sets)