fact: Definition Nop : pTM sig unit n := (NopTM; fun _ => tt).
imports: Undecidability(TM.Util.Prelim) Undecidability(TM.Util.TM_facts) Undecidability(TM.Basic.Mono) Undecidability(TM.Combinators.Combinators) Undecidability(TM.Compound.TMTac)