YES
proof of /export/starexec/sandbox2/benchmark/theBenchmark.xml
# AProVE Commit ID: 794c25de1cacf0d048858bcd21c9a779e1221865 marcel 20200619 unpublished dirty


Termination w.r.t. Q of the given QTRS could be proven:

(0) QTRS
(1) DependencyPairsProof [EQUIVALENT, 0 ms]
(2) QDP
(3) DependencyGraphProof [EQUIVALENT, 0 ms]
(4) QDP
(5) QDPSizeChangeProof [EQUIVALENT, 0 ms]
(6) YES


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(0)
Obligation:
Q restricted rewrite system:
The TRS R consists of the following rules:

   a(x1) -> x1
   a(a(x1)) -> a(b(c(a(x1))))
   c(b(x1)) -> a(b(a(x1)))

Q is empty.

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(1) DependencyPairsProof (EQUIVALENT)
Using Dependency Pairs [AG00,LPAR04] we result in the following initial DP problem.
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(2)
Obligation:
Q DP problem:
The TRS P consists of the following rules:

   A(a(x1)) -> A(b(c(a(x1))))
   A(a(x1)) -> C(a(x1))
   C(b(x1)) -> A(b(a(x1)))
   C(b(x1)) -> A(x1)

The TRS R consists of the following rules:

   a(x1) -> x1
   a(a(x1)) -> a(b(c(a(x1))))
   c(b(x1)) -> a(b(a(x1)))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
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(3) DependencyGraphProof (EQUIVALENT)
The approximation of the Dependency Graph [LPAR04,FROCOS05,EDGSTAR] contains 1 SCC with 2 less nodes.
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(4)
Obligation:
Q DP problem:
The TRS P consists of the following rules:

   A(a(x1)) -> C(a(x1))
   C(b(x1)) -> A(x1)

The TRS R consists of the following rules:

   a(x1) -> x1
   a(a(x1)) -> a(b(c(a(x1))))
   c(b(x1)) -> a(b(a(x1)))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
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(5) QDPSizeChangeProof (EQUIVALENT)
By using the subterm criterion [SUBTERM_CRITERION] together with the size-change analysis [AAECC05] we have proven that there are no infinite chains for this DP problem. 

From the DPs we obtained the following set of size-change graphs:
*C(b(x1)) -> A(x1)
The graph contains the following edges 1 > 1


*A(a(x1)) -> C(a(x1))
The graph contains the following edges 1 >= 1


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(6)
YES