Left Termination proof of /tmp/tmpPdv6yq/map.pl

Left Termination of the query pattern
map(g,a)
w.r.t. the given Prolog program could successfully be proven:

0 Prolog

↳1 PrologToDTProblemTransformerProof (⇒, 0 ms)

↳2 TRIPLES

↳3 TriplesToPiDPProof (⇒, 0 ms)

↳4 PiDP

↳5 DependencyGraphProof (⇔, 0 ms)

↳6 PiDP

↳7 PiDPToQDPProof (⇒, 0 ms)

↳8 QDP

↳9 QDPSizeChangeProof (⇔, 0 ms)

↳10 YES

(0) Obligation:

Clauses:

map([], L) :- ','(!, eq(L, [])).
map(X, .(Y, Ys)) :- ','(head(X, H), ','(tail(X, T), ','(p(H, Y), map(T, Ys)))).
head([], X1).
head(.(H, X2), H).
tail([], []).
tail(.(X3, T), T).
p(X, Y).
eq(X, X).

Query: map(g,a)

(1) PrologToDTProblemTransformerProof (SOUND transformation)

Built DT problem from termination graph DT10.

digraph dp_graph {
node [outthreshold=100, inthreshold=100];
1 [label="A: map(T1, T2)\n\nT1 is ground", fontsize=16, style=filled, fillcolor=lightyellow, color=red];
2 [label="2: map(T1, T2), SCOPE: 1, CLAUSE: 0 | map(T1, T2), SCOPE: 1, CLAUSE: 1\n\nT1 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
3 [label="3: ','(!_1, eq(T5, [])) | map([], T2), SCOPE: 1, CLAUSE: 1\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
4 [label="4: map(T1, T2), SCOPE: 1, CLAUSE: 1\n\nT1 is ground\nX5 is free\nmap(T1, T2) !=? map([], X5)", fontsize=16, style=filled, fillcolor=lightyellow];
5 [label="5: eq(T5, [])\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
6 [label="6: eq(T5, []), SCOPE: 2, CLAUSE: 7\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
7 [label="7: true\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
8 [label="8: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
9 [label="9: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
10 [label="10: ','(head(T12, X15), ','(tail(T12, X16), ','(p(X15, T15), map(X16, T16))))\n\nT12 is ground\nX5 is free\nX15 is free\nX16 is free\nmap(T12, T2) !=? map([], X5)", fontsize=16, style=filled, fillcolor=lightyellow];
11 [label="11: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
12 [label="12: ','(head(T12, X15), ','(tail(T12, X16), ','(p(X15, T15), map(X16, T16)))), SCOPE: 3, CLAUSE: 2 | ','(head(T12, X15), ','(tail(T12, X16), ','(p(X15, T15), map(X16, T16)))), SCOPE: 3, CLAUSE: 3\n\nT12 is ground\nX5 is free\nX15 is free\nX16 is free\nmap(T12, T2) !=? map([], X5)", fontsize=16, style=filled, fillcolor=lightyellow];
13 [label="13: ','(head(T12, X15), ','(tail(T12, X16), ','(p(X15, T15), map(X16, T16)))), SCOPE: 3, CLAUSE: 3\n\nT12 is ground\nX5 is free\nX15 is free\nX16 is free\nmap(T12, T2) !=? map([], X5)", fontsize=16, style=filled, fillcolor=lightyellow];
14 [label="14: ','(tail(.(T21, T22), X16), ','(p(T21, T15), map(X16, T16)))\n\nT21 is ground\nT22 is ground\nX16 is free", fontsize=16, style=filled, fillcolor=lightyellow];
15 [label="15: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
16 [label="16: ','(tail(.(T21, T22), X16), ','(p(T21, T15), map(X16, T16))), SCOPE: 4, CLAUSE: 4 | ','(tail(.(T21, T22), X16), ','(p(T21, T15), map(X16, T16))), SCOPE: 4, CLAUSE: 5\n\nT21 is ground\nT22 is ground\nX16 is free", fontsize=16, style=filled, fillcolor=lightyellow];
17 [label="17: ','(tail(.(T21, T22), X16), ','(p(T21, T15), map(X16, T16))), SCOPE: 4, CLAUSE: 5\n\nT21 is ground\nT22 is ground\nX16 is free", fontsize=16, style=filled, fillcolor=lightyellow];
18 [label="18: ','(p(T29, T15), map(T30, T16))\n\nT29 is ground\nT30 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
19 [label="19: ','(p(T29, T15), map(T30, T16)), SCOPE: 5, CLAUSE: 6\n\nT29 is ground\nT30 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
20 [label="20: map(T30, T40)\n\nT30 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
21 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
1 -> 21 [arrowhead = none ];
21 -> 2;

22 [label="EVAL with clause\nmap([], X5) :- ','(!_1, eq(X5, [])).\nand substitutionT1 -> [],\nT2 -> T5,\nX5 -> T5,\nT4 -> T5", fontsize=14, style = filled, fillcolor = lightblue];
2 -> 22 [arrowhead = none ];
22 -> 3;

23 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightgreen];
2 -> 23 [arrowhead = none ];
23 -> 4;

24 [label="CUT", fontsize=14, style = filled, fillcolor = lightgreen];
3 -> 24 [arrowhead = none ];
24 -> 5;

25 [label="EVAL with clause\nmap(X12, .(X13, X14)) :- ','(head(X12, X15), ','(tail(X12, X16), ','(p(X15, X13), map(X16, X14)))).\nand substitutionT1 -> T12,\nX12 -> T12,\nX13 -> T15,\nX14 -> T16,\nT2 -> .(T15, T16),\nT13 -> T15,\nT14 -> T16", fontsize=14, style = filled, fillcolor = lightblue];
4 -> 25 [arrowhead = none ];
25 -> 10;

26 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightgreen];
4 -> 26 [arrowhead = none ];
26 -> 11;

27 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
5 -> 27 [arrowhead = none ];
27 -> 6;

28 [label="EVAL with clause\neq(X8, X8).\nand substitutionT5 -> [],\nX8 -> [],\nT8 -> []", fontsize=14, style = filled, fillcolor = lightblue];
6 -> 28 [arrowhead = none ];
28 -> 7;

29 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightgreen];
6 -> 29 [arrowhead = none ];
29 -> 8;

30 [label="SUCCESS", fontsize=14, style = filled, fillcolor = lightgreen];
7 -> 30 [arrowhead = none ];
30 -> 9;

31 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
10 -> 31 [arrowhead = none ];
31 -> 12;

32 [label="BACKTRACK\nfor clause: head([], X1)\nwith clash: (map(T12, T2), map([], X5))", fontsize=14, style = filled, fillcolor = lightgreen];
12 -> 32 [arrowhead = none ];
32 -> 13;

33 [label="EVAL with clause\nhead(.(X23, X24), X23).\nand substitutionX23 -> T21,\nX24 -> T22,\nT12 -> .(T21, T22),\nX15 -> T21", fontsize=14, style = filled, fillcolor = lightblue];
13 -> 33 [arrowhead = none ];
33 -> 14;

34 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightgreen];
13 -> 34 [arrowhead = none ];
34 -> 15;

35 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
14 -> 35 [arrowhead = none ];
35 -> 16;

36 [label="BACKTRACK\nfor clause: tail([], [])because of non-unification", fontsize=14, style = filled, fillcolor = lightgreen];
16 -> 36 [arrowhead = none ];
36 -> 17;

37 [label="ONLY EVAL with clause\ntail(.(X31, X32), X32).\nand substitutionT21 -> T29,\nX31 -> T29,\nT22 -> T30,\nX32 -> T30,\nX16 -> T30", fontsize=14, style = filled, fillcolor = lightblue];
17 -> 37 [arrowhead = none ];
37 -> 18;

38 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
18 -> 38 [arrowhead = none ];
38 -> 19;

39 [label="ONLY EVAL with clause\np(X39, X40).\nand substitutionT29 -> T38,\nX39 -> T38,\nT15 -> T39,\nX40 -> T39,\nT16 -> T40", fontsize=14, style = filled, fillcolor = lightblue];
19 -> 39 [arrowhead = none ];
39 -> 20;

40 [label="INSTANCE with matching:\nT1 -> T30\nT2 -> T40", fontsize=14, style = filled, fillcolor = lightgrey];
20 -> 40 [arrowhead = none , style=dashed];
40 -> 1[style=dashed];

}

(2) Obligation:

Triples:

mapA(.(X1, X2), .(X3, X4)) :- mapA(X2, X4).

Clauses:

mapcA([], []).
mapcA(.(X1, X2), .(X3, X4)) :- mapcA(X2, X4).

Afs:

mapA(x1, x2) = mapA(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:
mapA_in: (b,f)
Transforming TRIPLES into the following Term Rewriting System:
Pi DP problem:
The TRS P consists of the following rules:

MAPA_IN_GA(.(X1, X2), .(X3, X4)) → U1_GA(X1, X2, X3, X4, mapA_in_ga(X2, X4))
MAPA_IN_GA(.(X1, X2), .(X3, X4)) → MAPA_IN_GA(X2, X4)

R is empty.
The argument filtering Pi contains the following mapping:
mapA_in_ga(x1, x2) = mapA_in_ga(x1)
.(x1, x2) = .(x2)
MAPA_IN_GA(x1, x2) = MAPA_IN_GA(x1)
U1_GA(x1, x2, x3, x4, x5) = U1_GA(x2, 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:

MAPA_IN_GA(.(X1, X2), .(X3, X4)) → U1_GA(X1, X2, X3, X4, mapA_in_ga(X2, X4))
MAPA_IN_GA(.(X1, X2), .(X3, X4)) → MAPA_IN_GA(X2, X4)

(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:

MAPA_IN_GA(.(X1, X2), .(X3, X4)) → MAPA_IN_GA(X2, X4)

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

MAPA_IN_GA(.(X2)) → MAPA_IN_GA(X2)

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:

MAPA_IN_GA(.(X2)) → MAPA_IN_GA(X2)
The graph contains the following edges 1 > 1