fact: Definition max3 a b c := max a (max b c).
imports: Arith Lia List Bool Eqdep_dec EqdepFacts Undecidability.Shared.Libs.DLW(utils_tac utils_nat utils_list finite pos vec) Undecidability.Synthetic(Definitions DecidabilityFacts EnumerabilityFacts ListEnumerabilityFacts ReducibilityFacts) Undecidability(Shared.ListAutomation Shared.Dec) Undecidability.MuRec.Util.recalg