Termination w.r.t. Q of the following Term Rewriting System could not be shown:

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

a(x1) → x1
a(x1) → b(c(x1))
a(b(b(x1))) → b(b(a(a(x1))))
b(x1) → x1

Q is empty.


QTRS
  ↳ DependencyPairsProof
  ↳ QTRS Reverse
  ↳ QTRS Reverse

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

a(x1) → x1
a(x1) → b(c(x1))
a(b(b(x1))) → b(b(a(a(x1))))
b(x1) → x1

Q is empty.

Using Dependency Pairs [1,15] we result in the following initial DP problem:
Q DP problem:
The TRS P consists of the following rules:

A(x1) → B(c(x1))
A(b(b(x1))) → A(x1)
A(b(b(x1))) → B(a(a(x1)))
A(b(b(x1))) → A(a(x1))
A(b(b(x1))) → B(b(a(a(x1))))

The TRS R consists of the following rules:

a(x1) → x1
a(x1) → b(c(x1))
a(b(b(x1))) → b(b(a(a(x1))))
b(x1) → x1

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

↳ QTRS
  ↳ DependencyPairsProof
QDP
      ↳ DependencyGraphProof
  ↳ QTRS Reverse
  ↳ QTRS Reverse

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

A(x1) → B(c(x1))
A(b(b(x1))) → A(x1)
A(b(b(x1))) → B(a(a(x1)))
A(b(b(x1))) → A(a(x1))
A(b(b(x1))) → B(b(a(a(x1))))

The TRS R consists of the following rules:

a(x1) → x1
a(x1) → b(c(x1))
a(b(b(x1))) → b(b(a(a(x1))))
b(x1) → x1

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The approximation of the Dependency Graph [15,17,22] contains 1 SCC with 3 less nodes.

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
QDP
  ↳ QTRS Reverse
  ↳ QTRS Reverse

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

A(b(b(x1))) → A(x1)
A(b(b(x1))) → A(a(x1))

The TRS R consists of the following rules:

a(x1) → x1
a(x1) → b(c(x1))
a(b(b(x1))) → b(b(a(a(x1))))
b(x1) → x1

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
We have reversed the following QTRS:
The set of rules R is

a(x1) → x1
a(x1) → b(c(x1))
a(b(b(x1))) → b(b(a(a(x1))))
b(x1) → x1

The set Q is empty.
We have obtained the following QTRS:

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

The set Q is empty.

↳ QTRS
  ↳ DependencyPairsProof
  ↳ QTRS Reverse
QTRS
  ↳ QTRS Reverse

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

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

Q is empty.

We have reversed the following QTRS:
The set of rules R is

a(x1) → x1
a(x1) → b(c(x1))
a(b(b(x1))) → b(b(a(a(x1))))
b(x1) → x1

The set Q is empty.
We have obtained the following QTRS:

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

The set Q is empty.

↳ QTRS
  ↳ DependencyPairsProof
  ↳ QTRS Reverse
  ↳ QTRS Reverse
QTRS

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

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

Q is empty.