(0) Obligation:

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

f(f(X)) → f(a(b(f(X))))
f(a(g(X))) → b(X)
b(X) → a(X)

Q is empty.

(1) RFCMatchBoundsTRSProof (EQUIVALENT transformation)

Termination of the TRS R could be shown with a Match Bound [MATCHBOUNDS1,MATCHBOUNDS2] of 2. This implies Q-termination of R.
The following rules were used to construct the certificate:

f(f(X)) → f(a(b(f(X))))
f(a(g(X))) → b(X)
b(X) → a(X)

The certificate found is represented by the following graph.

The certificate consists of the following enumerated nodes:

9629135, 9629136, 9629137, 9629138, 9629139, 9629140, 9629142, 9629141

Node 9629135 is start node and node 9629136 is final node.

Those nodes are connect through the following edges:

  • 9629135 to 9629136 labelled a_1(0), b_1(0), a_1(1)
  • 9629135 to 9629137 labelled f_1(0)
  • 9629136 to 9629136 labelled #_1(0)
  • 9629137 to 9629138 labelled a_1(0)
  • 9629138 to 9629139 labelled b_1(0), a_1(1)
  • 9629139 to 9629136 labelled f_1(0), b_1(1), a_1(2)
  • 9629139 to 9629140 labelled f_1(1)
  • 9629140 to 9629141 labelled a_1(1)
  • 9629142 to 9629136 labelled f_1(1), b_1(1), a_1(2)
  • 9629142 to 9629140 labelled f_1(1)
  • 9629141 to 9629142 labelled b_1(1), a_1(2)

(2) TRUE