(0) Obligation:
Q restricted rewrite system:
The TRS R consists of the following rules:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, 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:
F(a, f(b, x)) → F(b, f(a, x))
F(a, f(b, x)) → F(a, x)
F(b, f(c, x)) → F(c, f(b, x))
F(b, f(c, x)) → F(b, x)
F(c, f(a, x)) → F(a, f(c, x))
F(c, f(a, x)) → F(c, x)
The TRS R consists of the following rules:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, 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]. Here, we combined the reduction pair processor with the A-transformation [FROCOS05] which results in the following intermediate Q-DP Problem.
The a-transformed P is
a1(b(x)) → b1(a(x))
a1(b(x)) → a1(x)
b1(c(x)) → c1(b(x))
b1(c(x)) → b1(x)
c1(a(x)) → a1(c(x))
c1(a(x)) → c1(x)
The a-transformed usable rules are
a(b(x)) → b(a(x))
b(c(x)) → c(b(x))
c(a(x)) → a(c(x))
The following pairs can be oriented strictly and are deleted.
F(b, f(c, x)) → F(b, x)
The remaining pairs can at least be oriented weakly.
Used ordering: Combined order from the following AFS and order.
a1(
x1) =
x1
b(
x1) =
x1
b1(
x1) =
x1
a(
x1) =
x1
c(
x1) =
c(
x1)
c1(
x1) =
c1(
x1)
Recursive path order with status [RPO].
Quasi-Precedence:
[c1, c11]
Status:
c1: multiset
c11: multiset
The following usable rules [FROCOS05] were oriented:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, x))
(4) Obligation:
Q DP problem:
The TRS P consists of the following rules:
F(a, f(b, x)) → F(b, f(a, x))
F(a, f(b, x)) → F(a, x)
F(b, f(c, x)) → F(c, f(b, x))
F(c, f(a, x)) → F(a, f(c, x))
F(c, f(a, x)) → F(c, x)
The TRS R consists of the following rules:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, 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]. Here, we combined the reduction pair processor with the A-transformation [FROCOS05] which results in the following intermediate Q-DP Problem.
The a-transformed P is
a1(b(x)) → b1(a(x))
a1(b(x)) → a1(x)
b1(c(x)) → c1(b(x))
c1(a(x)) → a1(c(x))
c1(a(x)) → c1(x)
The a-transformed usable rules are
a(b(x)) → b(a(x))
b(c(x)) → c(b(x))
c(a(x)) → a(c(x))
The following pairs can be oriented strictly and are deleted.
F(a, f(b, x)) → F(b, f(a, x))
F(b, f(c, x)) → F(c, f(b, x))
F(c, f(a, x)) → F(a, f(c, x))
F(c, f(a, x)) → F(c, x)
The remaining pairs can at least be oriented weakly.
Used ordering: Combined order from the following AFS and order.
a1(
x1) =
a1
b(
x1) =
b
b1(
x1) =
b1
a(
x1) =
a(
x1)
c(
x1) =
x1
c1(
x1) =
c1(
x1)
Recursive path order with status [RPO].
Quasi-Precedence:
[a1, a1] > b1 > b
[a1, a1] > b1 > c11
Status:
a1: multiset
b: multiset
b1: []
a1: multiset
c11: [1]
The following usable rules [FROCOS05] were oriented:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, x))
(6) Obligation:
Q DP problem:
The TRS P consists of the following rules:
F(a, f(b, x)) → F(a, x)
The TRS R consists of the following rules:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, 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]. Here, we combined the reduction pair processor with the A-transformation [FROCOS05] which results in the following intermediate Q-DP Problem.
The a-transformed P is
a1(b(x)) → a1(x)
The a-transformed usable rules are
a(b(x)) → b(a(x))
b(c(x)) → c(b(x))
c(a(x)) → a(c(x))
The following pairs can be oriented strictly and are deleted.
F(a, f(b, x)) → F(a, x)
The remaining pairs can at least be oriented weakly.
Used ordering: Combined order from the following AFS and order.
a1(
x1) =
a1(
x1)
b(
x1) =
b(
x1)
a(
x1) =
x1
c(
x1) =
c
Recursive path order with status [RPO].
Quasi-Precedence:
[a11, b1, c]
Status:
a11: multiset
b1: multiset
c: multiset
The following usable rules [FROCOS05] were oriented:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, x))
(8) Obligation:
Q DP problem:
P is empty.
The TRS R consists of the following rules:
f(a, f(b, x)) → f(b, f(a, x))
f(b, f(c, x)) → f(c, f(b, x))
f(c, f(a, x)) → f(a, f(c, x))
Q is empty.
We have to consider all minimal (P,Q,R)-chains.
(9) PisEmptyProof (EQUIVALENT transformation)
The TRS P is empty. Hence, there is no (P,Q,R) chain.
(10) TRUE