fact: Definition llength (t : tape sig) := length (tape_local_l t).
imports: Undecidability(TM.Util.Prelim) Undecidability(TM.Basic.Mono) Undecidability(TM.Combinators.Combinators) Undecidability(TM.Compound.TMTac) Undecidability(TM.Compound.Multi) Coq(FunInd) Coq(Recdef)