Left Termination proof of /tmp/tmpF5IaZs/average-ioi.pl

Left Termination of the query pattern average(b,f,b) w.r.t. the given Prolog program could successfully be proven:

↳ PROLOG

  ↳ PrologToPiTRSProof

average₃(0₀, 0₀, 0₀).
average₃(0₀, s₁(0₀), 0₀).
average₃(0₀, s₁²(0₀), s₁(0₀)).
average₃(s₁(X), Y, Z) :- average₃(X, s₁(Y), Z).
average₃(X, s₁³(Y), s₁(Z)) :- average₃(s₁(X), Y, Z).

With regard to the inferred argument filtering the predicates were used in the following modes:
average₃: (b,f,b)
Transforming PROLOG into the following Term Rewriting System:
Pi-finite rewrite system:
The TRS R consists of the following rules:

average_3_in_gag₃(0_0, 0_0, 0_0) -> average_3_out_gag₃(0_0, 0_0, 0_0)
average_3_in_gag₃(0_0, s_1₁(0_0), 0_0) -> average_3_out_gag₃(0_0, s_1₁(0_0), 0_0)
average_3_in_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0)) -> average_3_out_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0))
average_3_in_gag₃(s_1₁(X), Y, Z) -> if_average_3_in_1_gag₄(X, Y, Z, average_3_in_gag₃(X, s_1₁(Y), Z))
average_3_in_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> if_average_3_in_2_gag₄(X, Y, Z, average_3_in_gag₃(s_1₁(X), Y, Z))
if_average_3_in_2_gag₄(X, Y, Z, average_3_out_gag₃(s_1₁(X), Y, Z)) -> average_3_out_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z))
if_average_3_in_1_gag₄(X, Y, Z, average_3_out_gag₃(X, s_1₁(Y), Z)) -> average_3_out_gag₃(s_1₁(X), Y, Z)

Infinitary Constructor Rewriting Termination of PiTRS implies Termination of PROLOG

↳ PROLOG

  ↳ PrologToPiTRSProof

    ↳ PiTRS

      ↳ DependencyPairsProof

Pi-finite rewrite system:
The TRS R consists of the following rules:

average_3_in_gag₃(0_0, 0_0, 0_0) -> average_3_out_gag₃(0_0, 0_0, 0_0)
average_3_in_gag₃(0_0, s_1₁(0_0), 0_0) -> average_3_out_gag₃(0_0, s_1₁(0_0), 0_0)
average_3_in_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0)) -> average_3_out_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0))
average_3_in_gag₃(s_1₁(X), Y, Z) -> if_average_3_in_1_gag₄(X, Y, Z, average_3_in_gag₃(X, s_1₁(Y), Z))
average_3_in_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> if_average_3_in_2_gag₄(X, Y, Z, average_3_in_gag₃(s_1₁(X), Y, Z))
if_average_3_in_2_gag₄(X, Y, Z, average_3_out_gag₃(s_1₁(X), Y, Z)) -> average_3_out_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z))
if_average_3_in_1_gag₄(X, Y, Z, average_3_out_gag₃(X, s_1₁(Y), Z)) -> average_3_out_gag₃(s_1₁(X), Y, Z)

AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z) -> IF_AVERAGE_3_IN_1_GAG₄(X, Y, Z, average_3_in_gag₃(X, s_1₁(Y), Z))
AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z) -> AVERAGE_3_IN_GAG₃(X, s_1₁(Y), Z)
AVERAGE_3_IN_GAG₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> IF_AVERAGE_3_IN_2_GAG₄(X, Y, Z, average_3_in_gag₃(s_1₁(X), Y, Z))
AVERAGE_3_IN_GAG₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z)

The TRS R consists of the following rules:

average_3_in_gag₃(0_0, 0_0, 0_0) -> average_3_out_gag₃(0_0, 0_0, 0_0)
average_3_in_gag₃(0_0, s_1₁(0_0), 0_0) -> average_3_out_gag₃(0_0, s_1₁(0_0), 0_0)
average_3_in_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0)) -> average_3_out_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0))
average_3_in_gag₃(s_1₁(X), Y, Z) -> if_average_3_in_1_gag₄(X, Y, Z, average_3_in_gag₃(X, s_1₁(Y), Z))
average_3_in_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> if_average_3_in_2_gag₄(X, Y, Z, average_3_in_gag₃(s_1₁(X), Y, Z))
if_average_3_in_2_gag₄(X, Y, Z, average_3_out_gag₃(s_1₁(X), Y, Z)) -> average_3_out_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z))
if_average_3_in_1_gag₄(X, Y, Z, average_3_out_gag₃(X, s_1₁(Y), Z)) -> average_3_out_gag₃(s_1₁(X), Y, Z)

The argument filtering Pi contains the following mapping:
average_3_in_gag₃(x1, x2, x3) = average_3_in_gag₂(x1, x3)
0_0 = 0_0
s_1₁(x1) = s_1₁(x1)
average_3_out_gag₃(x1, x2, x3) = average_3_out_gag₁(x2)
if_average_3_in_1_gag₄(x1, x2, x3, x4) = if_average_3_in_1_gag₁(x4)
if_average_3_in_2_gag₄(x1, x2, x3, x4) = if_average_3_in_2_gag₁(x4)
IF_AVERAGE_3_IN_1_GAG₄(x1, x2, x3, x4) = IF_AVERAGE_3_IN_1_GAG₁(x4)
IF_AVERAGE_3_IN_2_GAG₄(x1, x2, x3, x4) = IF_AVERAGE_3_IN_2_GAG₁(x4)
AVERAGE_3_IN_GAG₃(x1, x2, x3) = AVERAGE_3_IN_GAG₂(x1, x3)

We have to consider all (P,R,Pi)-chains

↳ PROLOG

  ↳ PrologToPiTRSProof

    ↳ PiTRS

      ↳ DependencyPairsProof

        ↳ PiDP

          ↳ DependencyGraphProof

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

AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z) -> IF_AVERAGE_3_IN_1_GAG₄(X, Y, Z, average_3_in_gag₃(X, s_1₁(Y), Z))
AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z) -> AVERAGE_3_IN_GAG₃(X, s_1₁(Y), Z)
AVERAGE_3_IN_GAG₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> IF_AVERAGE_3_IN_2_GAG₄(X, Y, Z, average_3_in_gag₃(s_1₁(X), Y, Z))
AVERAGE_3_IN_GAG₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z)

The TRS R consists of the following rules:

average_3_in_gag₃(0_0, 0_0, 0_0) -> average_3_out_gag₃(0_0, 0_0, 0_0)
average_3_in_gag₃(0_0, s_1₁(0_0), 0_0) -> average_3_out_gag₃(0_0, s_1₁(0_0), 0_0)
average_3_in_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0)) -> average_3_out_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0))
average_3_in_gag₃(s_1₁(X), Y, Z) -> if_average_3_in_1_gag₄(X, Y, Z, average_3_in_gag₃(X, s_1₁(Y), Z))
average_3_in_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> if_average_3_in_2_gag₄(X, Y, Z, average_3_in_gag₃(s_1₁(X), Y, Z))
if_average_3_in_2_gag₄(X, Y, Z, average_3_out_gag₃(s_1₁(X), Y, Z)) -> average_3_out_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z))
if_average_3_in_1_gag₄(X, Y, Z, average_3_out_gag₃(X, s_1₁(Y), Z)) -> average_3_out_gag₃(s_1₁(X), Y, Z)

↳ PROLOG

  ↳ PrologToPiTRSProof

    ↳ PiTRS

      ↳ DependencyPairsProof

        ↳ PiDP

          ↳ DependencyGraphProof

            ↳ PiDP

              ↳ UsableRulesProof

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

AVERAGE_3_IN_GAG₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z)
AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z) -> AVERAGE_3_IN_GAG₃(X, s_1₁(Y), Z)

The TRS R consists of the following rules:

average_3_in_gag₃(0_0, 0_0, 0_0) -> average_3_out_gag₃(0_0, 0_0, 0_0)
average_3_in_gag₃(0_0, s_1₁(0_0), 0_0) -> average_3_out_gag₃(0_0, s_1₁(0_0), 0_0)
average_3_in_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0)) -> average_3_out_gag₃(0_0, s_1₁(s_1₁(0_0)), s_1₁(0_0))
average_3_in_gag₃(s_1₁(X), Y, Z) -> if_average_3_in_1_gag₄(X, Y, Z, average_3_in_gag₃(X, s_1₁(Y), Z))
average_3_in_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> if_average_3_in_2_gag₄(X, Y, Z, average_3_in_gag₃(s_1₁(X), Y, Z))
if_average_3_in_2_gag₄(X, Y, Z, average_3_out_gag₃(s_1₁(X), Y, Z)) -> average_3_out_gag₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z))
if_average_3_in_1_gag₄(X, Y, Z, average_3_out_gag₃(X, s_1₁(Y), Z)) -> average_3_out_gag₃(s_1₁(X), Y, Z)

The argument filtering Pi contains the following mapping:
average_3_in_gag₃(x1, x2, x3) = average_3_in_gag₂(x1, x3)
0_0 = 0_0
s_1₁(x1) = s_1₁(x1)
average_3_out_gag₃(x1, x2, x3) = average_3_out_gag₁(x2)
if_average_3_in_1_gag₄(x1, x2, x3, x4) = if_average_3_in_1_gag₁(x4)
if_average_3_in_2_gag₄(x1, x2, x3, x4) = if_average_3_in_2_gag₁(x4)
AVERAGE_3_IN_GAG₃(x1, x2, x3) = AVERAGE_3_IN_GAG₂(x1, x3)

We have to consider all (P,R,Pi)-chains
For (infinitary) constructor rewriting we can delete all non-usable rules from R.

↳ PROLOG

  ↳ PrologToPiTRSProof

    ↳ PiTRS

      ↳ DependencyPairsProof

        ↳ PiDP

          ↳ DependencyGraphProof

            ↳ PiDP

              ↳ UsableRulesProof

                ↳ PiDP

                  ↳ PiDPToQDPProof

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

AVERAGE_3_IN_GAG₃(X, s_1₁(s_1₁(s_1₁(Y))), s_1₁(Z)) -> AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z)
AVERAGE_3_IN_GAG₃(s_1₁(X), Y, Z) -> AVERAGE_3_IN_GAG₃(X, s_1₁(Y), Z)

R is empty.
The argument filtering Pi contains the following mapping:
s_1₁(x1) = s_1₁(x1)
AVERAGE_3_IN_GAG₃(x1, x2, x3) = AVERAGE_3_IN_GAG₂(x1, x3)

We have to consider all (P,R,Pi)-chains
Transforming (infinitary) constructor rewriting Pi-DP problem into ordinary QDP problem by application of Pi.

↳ PROLOG

  ↳ PrologToPiTRSProof

    ↳ PiTRS

      ↳ DependencyPairsProof

        ↳ PiDP

          ↳ DependencyGraphProof

            ↳ PiDP

              ↳ UsableRulesProof

                ↳ PiDP

                  ↳ PiDPToQDPProof

                    ↳ QDP

                      ↳ QDPSizeChangeProof

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

AVERAGE_3_IN_GAG₂(X, s_1₁(Z)) -> AVERAGE_3_IN_GAG₂(s_1₁(X), Z)
AVERAGE_3_IN_GAG₂(s_1₁(X), Z) -> AVERAGE_3_IN_GAG₂(X, Z)

R is empty.
Q is empty.
We have to consider all (P,Q,R)-chains.
The head symbols of this DP problem are {AVERAGE_3_IN_GAG₂}.
By using the subterm criterion together with the size-change analysis 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:

AVERAGE_3_IN_GAG₂(X, s_1₁(Z)) -> AVERAGE_3_IN_GAG₂(s_1₁(X), Z)
The graph contains the following edges 2 > 2
AVERAGE_3_IN_GAG₂(s_1₁(X), Z) -> AVERAGE_3_IN_GAG₂(X, Z)
The graph contains the following edges 1 > 1, 2 >= 2