(0) Obligation:

Clauses:

overlap(Xs, Ys) :- ','(member(X, Xs), member(X, Ys)).
member(X, Y) :- ','(no(empty(Y)), head(Y, X)).
member(X, Y) :- ','(no(empty(Y)), ','(tail(Y, T), member(X, T))).
head([], X1).
head(.(H, X2), H).
tail([], []).
tail(.(X3, T), T).
empty([]).
no(X) :- ','(X, ','(!, failure(a))).
no(X4).
failure(b).

Queries:

overlap(g,g).

(1) PrologToDTProblemTransformerProof (SOUND transformation)

Built DT problem from termination graph.

(2) Obligation:

Triples:

member22(T60, .(T76, T77)) :- member22(T60, T77).
p3(T28, .(T28, T29), T6) :- member22(T28, T6).
p3(X139, .(T93, T94), T6) :- p3(X139, T94, T6).
overlap1(T5, T6) :- p3(X9, T5, T6).

Clauses:

memberc22(T53, .(T53, T54)).
memberc22(T60, .(T76, T77)) :- memberc22(T60, T77).
qc3(T28, .(T28, T29), T6) :- memberc22(T28, T6).
qc3(X139, .(T93, T94), T6) :- qc3(X139, T94, T6).

Afs:

overlap1(x1, x2)  =  overlap1(x1, x2)

(3) TriplesToPiDPProof (SOUND transformation)

We use the technique of [LOPSTR]. With regard to the inferred argument filtering the predicates were used in the following modes:
overlap1_in: (b,b)
p3_in: (f,b,b)
member22_in: (b,b)
Transforming TRIPLES into the following Term Rewriting System:
Pi DP problem:
The TRS P consists of the following rules:

OVERLAP1_IN_GG(T5, T6) → U4_GG(T5, T6, p3_in_agg(X9, T5, T6))
OVERLAP1_IN_GG(T5, T6) → P3_IN_AGG(X9, T5, T6)
P3_IN_AGG(T28, .(T28, T29), T6) → U2_AGG(T28, T29, T6, member22_in_gg(T28, T6))
P3_IN_AGG(T28, .(T28, T29), T6) → MEMBER22_IN_GG(T28, T6)
MEMBER22_IN_GG(T60, .(T76, T77)) → U1_GG(T60, T76, T77, member22_in_gg(T60, T77))
MEMBER22_IN_GG(T60, .(T76, T77)) → MEMBER22_IN_GG(T60, T77)
P3_IN_AGG(X139, .(T93, T94), T6) → U3_AGG(X139, T93, T94, T6, p3_in_agg(X139, T94, T6))
P3_IN_AGG(X139, .(T93, T94), T6) → P3_IN_AGG(X139, T94, T6)

R is empty.
The argument filtering Pi contains the following mapping:
p3_in_agg(x1, x2, x3)  =  p3_in_agg(x2, x3)
.(x1, x2)  =  .(x1, x2)
member22_in_gg(x1, x2)  =  member22_in_gg(x1, x2)
OVERLAP1_IN_GG(x1, x2)  =  OVERLAP1_IN_GG(x1, x2)
U4_GG(x1, x2, x3)  =  U4_GG(x1, x2, x3)
P3_IN_AGG(x1, x2, x3)  =  P3_IN_AGG(x2, x3)
U2_AGG(x1, x2, x3, x4)  =  U2_AGG(x1, x2, x3, x4)
MEMBER22_IN_GG(x1, x2)  =  MEMBER22_IN_GG(x1, x2)
U1_GG(x1, x2, x3, x4)  =  U1_GG(x1, x2, x3, x4)
U3_AGG(x1, x2, x3, x4, x5)  =  U3_AGG(x2, x3, x4, x5)

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

Infinitary Constructor Rewriting Termination of PiDP implies Termination of TRIPLES

(4) Obligation:

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

OVERLAP1_IN_GG(T5, T6) → U4_GG(T5, T6, p3_in_agg(X9, T5, T6))
OVERLAP1_IN_GG(T5, T6) → P3_IN_AGG(X9, T5, T6)
P3_IN_AGG(T28, .(T28, T29), T6) → U2_AGG(T28, T29, T6, member22_in_gg(T28, T6))
P3_IN_AGG(T28, .(T28, T29), T6) → MEMBER22_IN_GG(T28, T6)
MEMBER22_IN_GG(T60, .(T76, T77)) → U1_GG(T60, T76, T77, member22_in_gg(T60, T77))
MEMBER22_IN_GG(T60, .(T76, T77)) → MEMBER22_IN_GG(T60, T77)
P3_IN_AGG(X139, .(T93, T94), T6) → U3_AGG(X139, T93, T94, T6, p3_in_agg(X139, T94, T6))
P3_IN_AGG(X139, .(T93, T94), T6) → P3_IN_AGG(X139, T94, T6)

R is empty.
The argument filtering Pi contains the following mapping:
p3_in_agg(x1, x2, x3)  =  p3_in_agg(x2, x3)
.(x1, x2)  =  .(x1, x2)
member22_in_gg(x1, x2)  =  member22_in_gg(x1, x2)
OVERLAP1_IN_GG(x1, x2)  =  OVERLAP1_IN_GG(x1, x2)
U4_GG(x1, x2, x3)  =  U4_GG(x1, x2, x3)
P3_IN_AGG(x1, x2, x3)  =  P3_IN_AGG(x2, x3)
U2_AGG(x1, x2, x3, x4)  =  U2_AGG(x1, x2, x3, x4)
MEMBER22_IN_GG(x1, x2)  =  MEMBER22_IN_GG(x1, x2)
U1_GG(x1, x2, x3, x4)  =  U1_GG(x1, x2, x3, x4)
U3_AGG(x1, x2, x3, x4, x5)  =  U3_AGG(x2, x3, x4, x5)

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

(5) DependencyGraphProof (EQUIVALENT transformation)

The approximation of the Dependency Graph [LOPSTR] contains 2 SCCs with 6 less nodes.

(6) Complex Obligation (AND)

(7) Obligation:

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

MEMBER22_IN_GG(T60, .(T76, T77)) → MEMBER22_IN_GG(T60, T77)

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

(8) PiDPToQDPProof (EQUIVALENT transformation)

Transforming (infinitary) constructor rewriting Pi-DP problem [LOPSTR] into ordinary QDP problem [LPAR04] by application of Pi.

(9) Obligation:

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

MEMBER22_IN_GG(T60, .(T76, T77)) → MEMBER22_IN_GG(T60, T77)

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

(10) 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:

  • MEMBER22_IN_GG(T60, .(T76, T77)) → MEMBER22_IN_GG(T60, T77)
    The graph contains the following edges 1 >= 1, 2 > 2

(11) YES

(12) Obligation:

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

P3_IN_AGG(X139, .(T93, T94), T6) → P3_IN_AGG(X139, T94, T6)

R is empty.
The argument filtering Pi contains the following mapping:
.(x1, x2)  =  .(x1, x2)
P3_IN_AGG(x1, x2, x3)  =  P3_IN_AGG(x2, x3)

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

(13) PiDPToQDPProof (SOUND transformation)

Transforming (infinitary) constructor rewriting Pi-DP problem [LOPSTR] into ordinary QDP problem [LPAR04] by application of Pi.

(14) Obligation:

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

P3_IN_AGG(.(T93, T94), T6) → P3_IN_AGG(T94, T6)

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

(15) 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:

  • P3_IN_AGG(.(T93, T94), T6) → P3_IN_AGG(T94, T6)
    The graph contains the following edges 1 > 1, 2 >= 2

(16) YES