YES Termination w.r.t. Q proof of /home/cern_httpd/provide/research/cycsrs/tpdb/TPDB-d9b80194f163/SRS_Standard/Trafo_06/un05.srs

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

0 QTRS
↳1 QTRS Reverse (⇔, 0 ms)
↳2 QTRS
↳3 DependencyPairsProof (⇔, 6 ms)
↳4 QDP
↳5 QDPOrderProof (⇔, 43 ms)
↳6 QDP
↳7 QDPOrderProof (⇔, 812 ms)
↳8 QDP
↳9 DependencyGraphProof (⇔, 0 ms)
↳10 TRUE

(0) Obligation:

Q restricted rewrite system:
The TRS R consists of the following rules:

b(b(b(b(x)))) → b(b(b(a(b(x)))))
b(a(b(b(a(b(x)))))) → b(b(a(b(b(x)))))

Q is empty.

(1) QTRS Reverse (EQUIVALENT transformation)

We applied the QTRS Reverse Processor [REVERSE].

(2) Obligation:

Q restricted rewrite system:
The TRS R consists of the following rules:

b(b(b(b(x)))) → b(a(b(b(b(x)))))
b(a(b(b(a(b(x)))))) → b(b(a(b(b(x)))))

Q is empty.

(3) DependencyPairsProof (EQUIVALENT transformation)

Using Dependency Pairs [AG00,LPAR04] we result in the following initial DP problem.

(4) Obligation:

Q DP problem:
The TRS P consists of the following rules:

B(b(b(b(x)))) → B(a(b(b(b(x)))))
B(a(b(b(a(b(x)))))) → B(b(a(b(b(x)))))
B(a(b(b(a(b(x)))))) → B(a(b(b(x))))
B(a(b(b(a(b(x)))))) → B(b(x))

The TRS R consists of the following rules:

b(b(b(b(x)))) → b(a(b(b(b(x)))))
b(a(b(b(a(b(x)))))) → b(b(a(b(b(x)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.

(5) QDPOrderProof (EQUIVALENT transformation)

We use the reduction pair processor [LPAR04,JAR06].


The following pairs can be oriented strictly and are deleted.


B(a(b(b(a(b(x)))))) → B(a(b(b(x))))
B(a(b(b(a(b(x)))))) → B(b(x))
The remaining pairs can at least be oriented weakly.
Used ordering: Polynomial interpretation [POLO]:

POL(B(x1)) = x1   
POL(a(x1)) = x1   
POL(b(x1)) = 1 + x1   

The following usable rules [FROCOS05] with respect to the argument filtering of the ordering [JAR06] were oriented:

b(a(b(b(a(b(x)))))) → b(b(a(b(b(x)))))
b(b(b(b(x)))) → b(a(b(b(b(x)))))

(6) Obligation:

Q DP problem:
The TRS P consists of the following rules:

B(b(b(b(x)))) → B(a(b(b(b(x)))))
B(a(b(b(a(b(x)))))) → B(b(a(b(b(x)))))

The TRS R consists of the following rules:

b(b(b(b(x)))) → b(a(b(b(b(x)))))
b(a(b(b(a(b(x)))))) → b(b(a(b(b(x)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.

(7) QDPOrderProof (EQUIVALENT transformation)

We use the reduction pair processor [LPAR04,JAR06].


The following pairs can be oriented strictly and are deleted.


B(b(b(b(x)))) → B(a(b(b(b(x)))))
The remaining pairs can at least be oriented weakly.
Used ordering: Matrix interpretation [MATRO] with arctic natural numbers [ARCTIC]:

POL(B(x1)) = 0A +
[0A,-I,0A]
·x1

POL(b(x1)) =
/0A\
|-I|
\-I/
 +
/1A0A0A\
|-I-I0A|
\0A0A0A/
·x1

POL(a(x1)) =
/0A\
|0A|
\-I/
 +
/-I1A0A\
|-I0A1A|
\-I1A0A/
·x1

The following usable rules [FROCOS05] with respect to the argument filtering of the ordering [JAR06] were oriented:

b(a(b(b(a(b(x)))))) → b(b(a(b(b(x)))))
b(b(b(b(x)))) → b(a(b(b(b(x)))))

(8) Obligation:

Q DP problem:
The TRS P consists of the following rules:

B(a(b(b(a(b(x)))))) → B(b(a(b(b(x)))))

The TRS R consists of the following rules:

b(b(b(b(x)))) → b(a(b(b(b(x)))))
b(a(b(b(a(b(x)))))) → b(b(a(b(b(x)))))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.

(9) DependencyGraphProof (EQUIVALENT transformation)

The approximation of the Dependency Graph [LPAR04,FROCOS05,EDGSTAR] contains 0 SCCs with 1 less node.

(10) TRUE