(0) Obligation:
Clauses:
p(s(X), X).
plus(0, Y, Y).
plus(s(X), Y, s(Z)) :- ','(p(s(X), U), plus(U, Y, Z)).
Query: plus(g,a,a)
(1) PrologToDTProblemTransformerProof (SOUND transformation)
Built DT problem from termination graph DT10.
(2) Obligation:
Triples:
plusA(s(X1), X2, s(X3)) :- plusA(X1, X2, X3).
Clauses:
pluscA(0, X1, X1).
pluscA(s(X1), X2, s(X3)) :- pluscA(X1, X2, X3).
Afs:
plusA(x1, x2, x3) = plusA(x1)
(3) TriplesToPiDPProof (SOUND transformation)
We use the technique of [DT09]. With regard to the inferred argument filtering the predicates were used in the following modes:
plusA_in: (b,f,f)
Transforming
TRIPLES into the following
Term Rewriting System:
Pi DP problem:
The TRS P consists of the following rules:
PLUSA_IN_GAA(s(X1), X2, s(X3)) → U1_GAA(X1, X2, X3, plusA_in_gaa(X1, X2, X3))
PLUSA_IN_GAA(s(X1), X2, s(X3)) → PLUSA_IN_GAA(X1, X2, X3)
R is empty.
The argument filtering Pi contains the following mapping:
plusA_in_gaa(
x1,
x2,
x3) =
plusA_in_gaa(
x1)
s(
x1) =
s(
x1)
PLUSA_IN_GAA(
x1,
x2,
x3) =
PLUSA_IN_GAA(
x1)
U1_GAA(
x1,
x2,
x3,
x4) =
U1_GAA(
x1,
x4)
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:
PLUSA_IN_GAA(s(X1), X2, s(X3)) → U1_GAA(X1, X2, X3, plusA_in_gaa(X1, X2, X3))
PLUSA_IN_GAA(s(X1), X2, s(X3)) → PLUSA_IN_GAA(X1, X2, X3)
R is empty.
The argument filtering Pi contains the following mapping:
plusA_in_gaa(
x1,
x2,
x3) =
plusA_in_gaa(
x1)
s(
x1) =
s(
x1)
PLUSA_IN_GAA(
x1,
x2,
x3) =
PLUSA_IN_GAA(
x1)
U1_GAA(
x1,
x2,
x3,
x4) =
U1_GAA(
x1,
x4)
We have to consider all (P,R,Pi)-chains
(5) DependencyGraphProof (EQUIVALENT transformation)
The approximation of the Dependency Graph [LOPSTR] contains 1 SCC with 1 less node.
(6) Obligation:
Pi DP problem:
The TRS P consists of the following rules:
PLUSA_IN_GAA(s(X1), X2, s(X3)) → PLUSA_IN_GAA(X1, X2, X3)
R is empty.
The argument filtering Pi contains the following mapping:
s(
x1) =
s(
x1)
PLUSA_IN_GAA(
x1,
x2,
x3) =
PLUSA_IN_GAA(
x1)
We have to consider all (P,R,Pi)-chains
(7) PiDPToQDPProof (SOUND transformation)
Transforming (infinitary) constructor rewriting Pi-DP problem [LOPSTR] into ordinary QDP problem [LPAR04] by application of Pi.
(8) Obligation:
Q DP problem:
The TRS P consists of the following rules:
PLUSA_IN_GAA(s(X1)) → PLUSA_IN_GAA(X1)
R is empty.
Q is empty.
We have to consider all (P,Q,R)-chains.
(9) 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:
- PLUSA_IN_GAA(s(X1)) → PLUSA_IN_GAA(X1)
The graph contains the following edges 1 > 1
(10) YES