NO Nontermination Proof

Nontermination Proof

by ttt2 (version ttt2 1.15)

Input

The rewrite relation of the following TRS is considered.

Begin(a(a(x0))) Wait(Right1(x0))
Begin(a(x0)) Wait(Right2(x0))
Begin(a(x0)) Wait(Right3(x0))
Begin(b(x0)) Wait(Right4(x0))
Begin(a(a(x0))) Wait(Right5(x0))
Begin(a(x0)) Wait(Right6(x0))
Begin(R(x0)) Wait(Right7(x0))
Right1(b(End(x0))) Left(a(b(c(End(x0)))))
Right2(b(a(End(x0)))) Left(a(b(c(End(x0)))))
Right3(c(End(x0))) Left(a(c(End(x0))))
Right4(c(End(x0))) Left(b(a(End(x0))))
Right5(L(End(x0))) Left(L(a(b(c(End(x0))))))
Right6(L(a(End(x0)))) Left(L(a(b(c(End(x0))))))
Right7(c(End(x0))) Left(b(a(R(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))
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))
Right1(c(x0)) Ac(Right1(x0))
Right2(c(x0)) Ac(Right2(x0))
Right3(c(x0)) Ac(Right3(x0))
Right4(c(x0)) Ac(Right4(x0))
Right5(c(x0)) Ac(Right5(x0))
Right6(c(x0)) Ac(Right6(x0))
Right7(c(x0)) Ac(Right7(x0))
Right1(L(x0)) AL(Right1(x0))
Right2(L(x0)) AL(Right2(x0))
Right3(L(x0)) AL(Right3(x0))
Right4(L(x0)) AL(Right4(x0))
Right5(L(x0)) AL(Right5(x0))
Right6(L(x0)) AL(Right6(x0))
Right7(L(x0)) AL(Right7(x0))
Right1(R(x0)) AR(Right1(x0))
Right2(R(x0)) AR(Right2(x0))
Right3(R(x0)) AR(Right3(x0))
Right4(R(x0)) AR(Right4(x0))
Right5(R(x0)) AR(Right5(x0))
Right6(R(x0)) AR(Right6(x0))
Right7(R(x0)) AR(Right7(x0))
Ab(Left(x0)) Left(b(x0))
Aa(Left(x0)) Left(a(x0))
Ac(Left(x0)) Left(c(x0))
AL(Left(x0)) Left(L(x0))
AR(Left(x0)) Left(R(x0))
Wait(Left(x0)) Begin(x0)
b(a(a(x0))) a(b(c(x0)))
c(a(x0)) a(c(x0))
c(b(x0)) b(a(x0))
L(a(a(x0))) L(a(b(c(x0))))
c(R(x0)) b(a(R(x0)))

Proof

1 Loop

The following loop proves nontermination.

t0 = Begin(a(c(End(x11470))))
ε Wait(Right3(c(End(x11470))))
1 Wait(Left(a(c(End(x11470)))))
ε Begin(a(c(End(x11470))))
= t3
where t3 = t0σ and σ = {x11470/x11470}