NO Nontermination Proof

Nontermination Proof

by ttt2 (version ttt2 1.15)

Input

The rewrite relation of the following TRS is considered.

Begin(a(s(s(x0)))) Wait(Right1(x0))
Begin(s(s(x0))) Wait(Right2(x0))
Begin(s(x0)) Wait(Right3(x0))
Begin(b(a(a(b(b(s(s(x0)))))))) Wait(Right4(x0))
Begin(a(a(b(b(s(s(x0))))))) Wait(Right5(x0))
Begin(a(b(b(s(s(x0)))))) Wait(Right6(x0))
Begin(b(b(s(s(x0))))) Wait(Right7(x0))
Begin(b(s(s(x0)))) Wait(Right8(x0))
Begin(s(s(x0))) Wait(Right9(x0))
Begin(s(x0)) Wait(Right10(x0))
Begin(b(a(a(b(b(b(b(x0)))))))) Wait(Right11(x0))
Begin(a(a(b(b(b(b(x0))))))) Wait(Right12(x0))
Begin(a(b(b(b(b(x0)))))) Wait(Right13(x0))
Begin(b(b(b(b(x0))))) Wait(Right14(x0))
Begin(b(b(b(x0)))) Wait(Right15(x0))
Begin(b(b(x0))) Wait(Right16(x0))
Begin(b(x0)) Wait(Right17(x0))
Begin(a(b(b(a(a(a(a(x0)))))))) Wait(Right18(x0))
Begin(b(b(a(a(a(a(x0))))))) Wait(Right19(x0))
Begin(b(a(a(a(a(x0)))))) Wait(Right20(x0))
Begin(a(a(a(a(x0))))) Wait(Right21(x0))
Begin(a(a(a(x0)))) Wait(Right22(x0))
Begin(a(a(x0))) Wait(Right23(x0))
Begin(a(x0)) Wait(Right24(x0))
Right1(a(End(x0))) Left(s(s(a(a(End(x0))))))
Right2(a(a(End(x0)))) Left(s(s(a(a(End(x0))))))
Right3(a(a(s(End(x0))))) Left(s(s(a(a(End(x0))))))
Right4(b(End(x0))) Left(a(a(b(b(s(s(a(a(End(x0))))))))))
Right5(b(b(End(x0)))) Left(a(a(b(b(s(s(a(a(End(x0))))))))))
Right6(b(b(a(End(x0))))) Left(a(a(b(b(s(s(a(a(End(x0))))))))))
Right7(b(b(a(a(End(x0)))))) Left(a(a(b(b(s(s(a(a(End(x0))))))))))
Right8(b(b(a(a(b(End(x0))))))) Left(a(a(b(b(s(s(a(a(End(x0))))))))))
Right9(b(b(a(a(b(b(End(x0)))))))) Left(a(a(b(b(s(s(a(a(End(x0))))))))))
Right10(b(b(a(a(b(b(s(End(x0))))))))) Left(a(a(b(b(s(s(a(a(End(x0))))))))))
Right11(b(End(x0))) Left(a(a(b(b(a(a(b(b(End(x0))))))))))
Right12(b(b(End(x0)))) Left(a(a(b(b(a(a(b(b(End(x0))))))))))
Right13(b(b(a(End(x0))))) Left(a(a(b(b(a(a(b(b(End(x0))))))))))
Right14(b(b(a(a(End(x0)))))) Left(a(a(b(b(a(a(b(b(End(x0))))))))))
Right15(b(b(a(a(b(End(x0))))))) Left(a(a(b(b(a(a(b(b(End(x0))))))))))
Right16(b(b(a(a(b(b(End(x0)))))))) Left(a(a(b(b(a(a(b(b(End(x0))))))))))
Right17(b(b(a(a(b(b(b(End(x0))))))))) Left(a(a(b(b(a(a(b(b(End(x0))))))))))
Right18(a(End(x0))) Left(b(b(a(a(b(b(a(a(End(x0))))))))))
Right19(a(a(End(x0)))) Left(b(b(a(a(b(b(a(a(End(x0))))))))))
Right20(a(a(b(End(x0))))) Left(b(b(a(a(b(b(a(a(End(x0))))))))))
Right21(a(a(b(b(End(x0)))))) Left(b(b(a(a(b(b(a(a(End(x0))))))))))
Right22(a(a(b(b(a(End(x0))))))) Left(b(b(a(a(b(b(a(a(End(x0))))))))))
Right23(a(a(b(b(a(a(End(x0)))))))) Left(b(b(a(a(b(b(a(a(End(x0))))))))))
Right24(a(a(b(b(a(a(a(End(x0))))))))) Left(b(b(a(a(b(b(a(a(End(x0))))))))))
Right1(a(x0)) Aa(Right1(x0))
Right2(a(x0)) Aa(Right2(x0))
Right3(a(x0)) Aa(Right3(x0))
Right4(a(x0)) Aa(Right4(x0))
Right5(a(x0)) Aa(Right5(x0))
Right6(a(x0)) Aa(Right6(x0))
Right7(a(x0)) Aa(Right7(x0))
Right8(a(x0)) Aa(Right8(x0))
Right9(a(x0)) Aa(Right9(x0))
Right10(a(x0)) Aa(Right10(x0))
Right11(a(x0)) Aa(Right11(x0))
Right12(a(x0)) Aa(Right12(x0))
Right13(a(x0)) Aa(Right13(x0))
Right14(a(x0)) Aa(Right14(x0))
Right15(a(x0)) Aa(Right15(x0))
Right16(a(x0)) Aa(Right16(x0))
Right17(a(x0)) Aa(Right17(x0))
Right18(a(x0)) Aa(Right18(x0))
Right19(a(x0)) Aa(Right19(x0))
Right20(a(x0)) Aa(Right20(x0))
Right21(a(x0)) Aa(Right21(x0))
Right22(a(x0)) Aa(Right22(x0))
Right23(a(x0)) Aa(Right23(x0))
Right24(a(x0)) Aa(Right24(x0))
Right1(s(x0)) As(Right1(x0))
Right2(s(x0)) As(Right2(x0))
Right3(s(x0)) As(Right3(x0))
Right4(s(x0)) As(Right4(x0))
Right5(s(x0)) As(Right5(x0))
Right6(s(x0)) As(Right6(x0))
Right7(s(x0)) As(Right7(x0))
Right8(s(x0)) As(Right8(x0))
Right9(s(x0)) As(Right9(x0))
Right10(s(x0)) As(Right10(x0))
Right11(s(x0)) As(Right11(x0))
Right12(s(x0)) As(Right12(x0))
Right13(s(x0)) As(Right13(x0))
Right14(s(x0)) As(Right14(x0))
Right15(s(x0)) As(Right15(x0))
Right16(s(x0)) As(Right16(x0))
Right17(s(x0)) As(Right17(x0))
Right18(s(x0)) As(Right18(x0))
Right19(s(x0)) As(Right19(x0))
Right20(s(x0)) As(Right20(x0))
Right21(s(x0)) As(Right21(x0))
Right22(s(x0)) As(Right22(x0))
Right23(s(x0)) As(Right23(x0))
Right24(s(x0)) As(Right24(x0))
Right1(b(x0)) Ab(Right1(x0))
Right2(b(x0)) Ab(Right2(x0))
Right3(b(x0)) Ab(Right3(x0))
Right4(b(x0)) Ab(Right4(x0))
Right5(b(x0)) Ab(Right5(x0))
Right6(b(x0)) Ab(Right6(x0))
Right7(b(x0)) Ab(Right7(x0))
Right8(b(x0)) Ab(Right8(x0))
Right9(b(x0)) Ab(Right9(x0))
Right10(b(x0)) Ab(Right10(x0))
Right11(b(x0)) Ab(Right11(x0))
Right12(b(x0)) Ab(Right12(x0))
Right13(b(x0)) Ab(Right13(x0))
Right14(b(x0)) Ab(Right14(x0))
Right15(b(x0)) Ab(Right15(x0))
Right16(b(x0)) Ab(Right16(x0))
Right17(b(x0)) Ab(Right17(x0))
Right18(b(x0)) Ab(Right18(x0))
Right19(b(x0)) Ab(Right19(x0))
Right20(b(x0)) Ab(Right20(x0))
Right21(b(x0)) Ab(Right21(x0))
Right22(b(x0)) Ab(Right22(x0))
Right23(b(x0)) Ab(Right23(x0))
Right24(b(x0)) Ab(Right24(x0))
Aa(Left(x0)) Left(a(x0))
As(Left(x0)) Left(s(x0))
Ab(Left(x0)) Left(b(x0))
Wait(Left(x0)) Begin(x0)
a(a(s(s(x0)))) s(s(a(a(x0))))
b(b(a(a(b(b(s(s(x0)))))))) a(a(b(b(s(s(a(a(x0))))))))
b(b(a(a(b(b(b(b(x0)))))))) a(a(b(b(a(a(b(b(x0))))))))
a(a(b(b(a(a(a(a(x0)))))))) b(b(a(a(b(b(a(a(x0))))))))

Proof

1 Loop

The following loop proves nontermination.

t0 = Begin(s(s(a(a(End(x60698))))))
ε Wait(Right2(a(a(End(x60698)))))
1 Wait(Left(s(s(a(a(End(x60698)))))))
ε Begin(s(s(a(a(End(x60698))))))
= t3
where t3 = t0σ and σ = {x60698/x60698}