Left Termination of the query pattern overlap_in_2(g, g) w.r.t. the given Prolog program could not be shown:

(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) CutEliminatorProof (SOUND transformation)

Eliminated all cuts by simply ignoring them[PROLOG].

(2) 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).