NO Nontermination Proof

Nontermination Proof

by ttt2 (version ttt2 1.15)

Input

The rewrite relation of the following TRS is considered.

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

Proof

1 Loop

The following loop proves nontermination.

t0 = Begin(b(b(b(a(a(a(b(End(x51175)))))))))
ε Wait(Right12(b(a(a(a(b(End(x51175))))))))
1 Wait(Left(b(b(b(a(a(a(b(End(x51175))))))))))
ε Begin(b(b(b(a(a(a(b(End(x51175)))))))))
= t3
where t3 = t0σ and σ = {x51175/x51175}