YES Termination w.r.t. Q proof of Transformed_CSR_04_Ex1_2_Luc02c_GM.ari

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

0 QTRS
↳1 DependencyPairsProof (⇔, 0 ms)
↳2 QDP
↳3 QDPOrderProof (⇔, 39 ms)
↳4 QDP
↳5 QDPOrderProof (⇔, 9 ms)
↳6 QDP
↳7 DependencyGraphProof (⇔, 0 ms)
↳8 QDP
↳9 QDPOrderProof (⇔, 0 ms)
↳10 QDP
↳11 QDPOrderProof (⇔, 0 ms)
↳12 QDP
↳13 DependencyGraphProof (⇔, 0 ms)
↳14 QDP
↳15 UsableRulesProof (⇔, 0 ms)
↳16 QDP
↳17 QDPSizeChangeProof (⇔, 0 ms)
↳18 YES

(0) Obligation:

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

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)

Q is empty.

(1) DependencyPairsProof (EQUIVALENT transformation)

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

(2) Obligation:

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

A__2ND(cons(X, cons(Y, Z))) → MARK(Y)
A__FROM(X) → MARK(X)
MARK(2nd(X)) → A__2ND(mark(X))
MARK(2nd(X)) → MARK(X)
MARK(from(X)) → A__FROM(mark(X))
MARK(from(X)) → MARK(X)
MARK(cons(X1, X2)) → MARK(X1)
MARK(s(X)) → MARK(X)

The TRS R consists of the following rules:

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)

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

(3) QDPOrderProof (EQUIVALENT transformation)

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


The following pairs can be oriented strictly and are deleted.


MARK(from(X)) → MARK(X)
The remaining pairs can at least be oriented weakly.
Used ordering: Matrix interpretation [MATRO] with arctic natural numbers [ARCTIC]:

POL(A__2ND(x1)) = 3A + 0A·x1

POL(cons(x1, x2)) = -I + 0A·x1 + 0A·x2

POL(MARK(x1)) = 3A + 0A·x1

POL(A__FROM(x1)) = 5A + 0A·x1

POL(2nd(x1)) = 4A + 0A·x1

POL(mark(x1)) = 3A + 0A·x1

POL(from(x1)) = 5A + 1A·x1

POL(s(x1)) = 4A + 0A·x1

POL(a__2nd(x1)) = 4A + 0A·x1

POL(a__from(x1)) = 5A + 1A·x1

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

mark(2nd(X)) → a__2nd(mark(X))
a__2nd(cons(X, cons(Y, Z))) → mark(Y)
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)
a__from(X) → cons(mark(X), from(s(X)))

(4) Obligation:

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

A__2ND(cons(X, cons(Y, Z))) → MARK(Y)
A__FROM(X) → MARK(X)
MARK(2nd(X)) → A__2ND(mark(X))
MARK(2nd(X)) → MARK(X)
MARK(from(X)) → A__FROM(mark(X))
MARK(cons(X1, X2)) → MARK(X1)
MARK(s(X)) → MARK(X)

The TRS R consists of the following rules:

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(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.


MARK(from(X)) → A__FROM(mark(X))
The remaining pairs can at least be oriented weakly.
Used ordering: Polynomial interpretation [POLO,RATPOLO]:

POL(2nd(x1)) = [4]x1   
POL(A__2ND(x1)) = [4] + [4]x1   
POL(A__FROM(x1)) = [4] + [2]x1   
POL(MARK(x1)) = [4] + x1   
POL(a__2nd(x1)) = [4]x1   
POL(a__from(x1)) = [1/2] + [4]x1   
POL(cons(x1, x2)) = x1 + [1/4]x2   
POL(from(x1)) = [1/2] + [4]x1   
POL(mark(x1)) = x1   
POL(s(x1)) = [2]x1   
The value of delta used in the strict ordering is 1/2.
The following usable rules [FROCOS05] with respect to the argument filtering of the ordering [JAR06] were oriented:

mark(2nd(X)) → a__2nd(mark(X))
a__2nd(cons(X, cons(Y, Z))) → mark(Y)
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)
a__from(X) → cons(mark(X), from(s(X)))

(6) Obligation:

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

A__2ND(cons(X, cons(Y, Z))) → MARK(Y)
A__FROM(X) → MARK(X)
MARK(2nd(X)) → A__2ND(mark(X))
MARK(2nd(X)) → MARK(X)
MARK(cons(X1, X2)) → MARK(X1)
MARK(s(X)) → MARK(X)

The TRS R consists of the following rules:

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)

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

(7) DependencyGraphProof (EQUIVALENT transformation)

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

(8) Obligation:

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

MARK(2nd(X)) → A__2ND(mark(X))
A__2ND(cons(X, cons(Y, Z))) → MARK(Y)
MARK(2nd(X)) → MARK(X)
MARK(cons(X1, X2)) → MARK(X1)
MARK(s(X)) → MARK(X)

The TRS R consists of the following rules:

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)

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

(9) QDPOrderProof (EQUIVALENT transformation)

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


The following pairs can be oriented strictly and are deleted.


MARK(cons(X1, X2)) → MARK(X1)
The remaining pairs can at least be oriented weakly.
Used ordering: Matrix interpretation [MATRO] with arctic natural numbers [ARCTIC]:

POL(MARK(x1)) = 5A + 5A·x1

POL(2nd(x1)) = -I + 0A·x1

POL(A__2ND(x1)) = 5A + 2A·x1

POL(mark(x1)) = 1A + 0A·x1

POL(cons(x1, x2)) = 4A + 3A·x1 + 0A·x2

POL(s(x1)) = 0A + 0A·x1

POL(a__2nd(x1)) = 1A + 0A·x1

POL(from(x1)) = 5A + 3A·x1

POL(a__from(x1)) = 5A + 3A·x1

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

mark(2nd(X)) → a__2nd(mark(X))
a__2nd(cons(X, cons(Y, Z))) → mark(Y)
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)
a__from(X) → cons(mark(X), from(s(X)))

(10) Obligation:

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

MARK(2nd(X)) → A__2ND(mark(X))
A__2ND(cons(X, cons(Y, Z))) → MARK(Y)
MARK(2nd(X)) → MARK(X)
MARK(s(X)) → MARK(X)

The TRS R consists of the following rules:

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)

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

(11) QDPOrderProof (EQUIVALENT transformation)

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


The following pairs can be oriented strictly and are deleted.


MARK(2nd(X)) → A__2ND(mark(X))
MARK(2nd(X)) → MARK(X)
The remaining pairs can at least be oriented weakly.
Used ordering: Polynomial interpretation [POLO,RATPOLO]:

POL(2nd(x1)) = [1/4] + [4]x1   
POL(A__2ND(x1)) = [2]x1   
POL(MARK(x1)) = [1/2]x1   
POL(a__2nd(x1)) = [1/4] + [4]x1   
POL(a__from(x1)) = [4]x1   
POL(cons(x1, x2)) = [2]x1 + [1/4]x2   
POL(from(x1)) = [4]x1   
POL(mark(x1)) = x1   
POL(s(x1)) = [2]x1   
The value of delta used in the strict ordering is 1/8.
The following usable rules [FROCOS05] with respect to the argument filtering of the ordering [JAR06] were oriented:

mark(2nd(X)) → a__2nd(mark(X))
a__2nd(cons(X, cons(Y, Z))) → mark(Y)
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)
a__from(X) → cons(mark(X), from(s(X)))

(12) Obligation:

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

A__2ND(cons(X, cons(Y, Z))) → MARK(Y)
MARK(s(X)) → MARK(X)

The TRS R consists of the following rules:

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)

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

(13) DependencyGraphProof (EQUIVALENT transformation)

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

(14) Obligation:

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

MARK(s(X)) → MARK(X)

The TRS R consists of the following rules:

a__2nd(cons(X, cons(Y, Z))) → mark(Y)
a__from(X) → cons(mark(X), from(s(X)))
mark(2nd(X)) → a__2nd(mark(X))
mark(from(X)) → a__from(mark(X))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
a__2nd(X) → 2nd(X)
a__from(X) → from(X)

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

(15) UsableRulesProof (EQUIVALENT transformation)

We can use the usable rules and reduction pair processor [LPAR04] with the Ce-compatible extension of the polynomial order that maps every function symbol to the sum of its arguments. Then, we can delete all non-usable rules [FROCOS05] from R.

(16) Obligation:

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

MARK(s(X)) → MARK(X)

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

(17) QDPSizeChangeProof (EQUIVALENT transformation)

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:

  • MARK(s(X)) → MARK(X)
    The graph contains the following edges 1 > 1

(18) YES