Left Termination proof of /tmp/tmpyFzEZV/NJ5.pl

Left Termination of the query pattern f_in_3(g, g, a) w.r.t. the given Prolog program could successfully be proven:

0 Prolog

↳1 PrologToDTProblemTransformerProof (⇐)

↳2 TRIPLES

↳3 TriplesToPiDPProof (⇐)

↳4 PiDP

↳5 DependencyGraphProof (⇔)

↳6 PiDP

↳7 PiDPToQDPProof (⇐)

↳8 QDP

↳9 QDPSizeChangeProof (⇔)

↳10 YES

(0) Obligation:

Clauses:

f(RES, [], RES).
f([], .(Head, Tail), RES) :- f(.(Head, Tail), Tail, RES).
f(.(Head, Tail), Y, RES) :- f(Y, Tail, RES).

Queries:

f(g,g,a).

(1) PrologToDTProblemTransformerProof (SOUND transformation)

Built DT problem from termination graph.

digraph dp_graph {
node [outthreshold=100, inthreshold=100];
1 [label="1: f(T1, T2, T3)\n\nT1 is ground\nT2 is ground", fontsize=16, style=filled, fillcolor=lightyellow, color=red];
2 [label="2: f(T1, T2, T3), SCOPE: 1, CLAUSE: 0 | f(T1, T2, T3), SCOPE: 1, CLAUSE: 1 | f(T1, T2, T3), SCOPE: 1, CLAUSE: 2\n\nT1 is ground\nT2 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
3 [label="3: true | f(T5, [], T3), SCOPE: 1, CLAUSE: 1 | f(T5, [], T3), SCOPE: 1, CLAUSE: 2\n\nT5 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
4 [label="4: f(T1, T2, T3), SCOPE: 1, CLAUSE: 1 | f(T1, T2, T3), SCOPE: 1, CLAUSE: 2\n\nT1 is ground\nT2 is ground\nf(T1, T2, T3) !=? f(X2, [], X2)", fontsize=16, style=filled, fillcolor=lightyellow];
5 [label="5: f(T5, [], T3), SCOPE: 1, CLAUSE: 1 | f(T5, [], T3), SCOPE: 1, CLAUSE: 2\n\nT5 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
6 [label="6: f(T5, [], T3), SCOPE: 1, CLAUSE: 2\n\nT5 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
7 [label="7: f([], T10, T12)\n\nT10 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
8 [label="8: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
9 [label="9: f([], T10, T12), SCOPE: 2, CLAUSE: 0 | f([], T10, T12), SCOPE: 2, CLAUSE: 1 | f([], T10, T12), SCOPE: 2, CLAUSE: 2\n\nT10 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
10 [label="10: f([], T10, T12), SCOPE: 2, CLAUSE: 0\n\nT10 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
11 [label="11: f([], T10, T12), SCOPE: 2, CLAUSE: 1 | f([], T10, T12), SCOPE: 2, CLAUSE: 2\n\nT10 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
12 [label="12: true\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
13 [label="13: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
14 [label="14: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
15 [label="15: f([], T10, T12), SCOPE: 2, CLAUSE: 1\n\nT10 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
16 [label="16: f([], T10, T12), SCOPE: 2, CLAUSE: 2\n\nT10 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
17 [label="17: f(.(T25, T26), T26, T28)\n\nT25 is ground\nT26 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
18 [label="18: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
19 [label="19: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
20 [label="20: f(.(T36, T37), T37, T39) | f([], .(T36, T37), T3), SCOPE: 1, CLAUSE: 2\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
21 [label="21: f(T1, T2, T3), SCOPE: 1, CLAUSE: 2\n\nT1 is ground\nT2 is ground\nf(T1, T2, T3) !=? f(X2, [], X2)\nf(T1, T2, T3) !=? f([], .(X52, X53), X54)", fontsize=16, style=filled, fillcolor=lightyellow];
22 [label="22: f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 0 | f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 1 | f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 2 | ?_3 | f([], .(T36, T37), T3), SCOPE: 1, CLAUSE: 2\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
23 [label="23: f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 0\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
24 [label="24: f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 1 | f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 2 | ?_3 | f([], .(T36, T37), T3), SCOPE: 1, CLAUSE: 2\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
25 [label="25: true\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
26 [label="26: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
27 [label="27: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
28 [label="28: f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 2 | ?_3 | f([], .(T36, T37), T3), SCOPE: 1, CLAUSE: 2\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
29 [label="29: f(.(T36, T37), T37, T39), SCOPE: 3, CLAUSE: 2\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
30 [label="30: ?_3 | f([], .(T36, T37), T3), SCOPE: 1, CLAUSE: 2\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
31 [label="31: f(T69, T69, T71)\n\nT69 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
32 [label="32: f(T69, T69, T71), SCOPE: 4, CLAUSE: 0 | f(T69, T69, T71), SCOPE: 4, CLAUSE: 1 | f(T69, T69, T71), SCOPE: 4, CLAUSE: 2\n\nT69 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
33 [label="33: f(T69, T69, T71), SCOPE: 4, CLAUSE: 0\n\nT69 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
34 [label="34: f(T69, T69, T71), SCOPE: 4, CLAUSE: 1 | f(T69, T69, T71), SCOPE: 4, CLAUSE: 2\n\nT69 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
35 [label="35: true\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
36 [label="36: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
37 [label="37: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
38 [label="38: f(T69, T69, T71), SCOPE: 4, CLAUSE: 2\n\nT69 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
39 [label="39: f(.(T85, T86), T86, T88)\n\nT85 is ground\nT86 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
40 [label="40: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
41 [label="41: f([], .(T36, T37), T3), SCOPE: 1, CLAUSE: 2\n\nT36 is ground\nT37 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
42 [label="42: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
43 [label="43: f(T99, T98, T101)\n\nT98 is ground\nT99 is ground\nf(.(T97, T98), T99, T3) !=? f(X2, [], X2)", fontsize=16, style=filled, fillcolor=lightyellow];
44 [label="44: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
45 [label="45: f(T99, T98, T101), SCOPE: 5, CLAUSE: 0 | f(T99, T98, T101), SCOPE: 5, CLAUSE: 1 | f(T99, T98, T101), SCOPE: 5, CLAUSE: 2\n\nT98 is ground\nT99 is ground\nf(.(T97, T98), T99, T3) !=? f(X2, [], X2)", fontsize=16, style=filled, fillcolor=lightyellow];
46 [label="46: f(T99, T98, T101), SCOPE: 5, CLAUSE: 0\n\nT98 is ground\nT99 is ground\nf(.(T97, T98), T99, T3) !=? f(X2, [], X2)", fontsize=16, style=filled, fillcolor=lightyellow];
47 [label="47: f(T99, T98, T101), SCOPE: 5, CLAUSE: 1 | f(T99, T98, T101), SCOPE: 5, CLAUSE: 2\n\nT98 is ground\nT99 is ground\nf(.(T97, T98), T99, T3) !=? f(X2, [], X2)", fontsize=16, style=filled, fillcolor=lightyellow];
48 [label="48: true\n\n", fontsize=16, style=filled, fillcolor=lightyellow];
49 [label="49: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
50 [label="50: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
51 [label="51: f(T99, T98, T101), SCOPE: 5, CLAUSE: 1\n\nT98 is ground\nT99 is ground\nf(.(T97, T98), T99, T3) !=? f(X2, [], X2)", fontsize=16, style=filled, fillcolor=lightyellow];
52 [label="52: f(T99, T98, T101), SCOPE: 5, CLAUSE: 2\n\nT98 is ground\nT99 is ground\nf(.(T97, T98), T99, T3) !=? f(X2, [], X2)", fontsize=16, style=filled, fillcolor=lightyellow];
53 [label="53: f(.(T119, T120), T120, T122)\n\nT119 is ground\nT120 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
54 [label="54: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
55 [label="55: f(T137, T136, T139)\n\nT136 is ground\nT137 is ground", fontsize=16, style=filled, fillcolor=lightyellow];
56 [label="56: \n\n", fontsize=16, style=filled, fillcolor=lightyellow];
57 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
1 -> 57 [arrowhead = none ];
57 -> 2;

58 [label="EVAL with clause\nf(X2, [], X2).\nand substitution\nT1 -> T5\nX2 -> T5\nT2 -> []\nT3 -> T5", fontsize=14, style = filled, fillcolor = lightblue];
2 -> 58 [arrowhead = none ];
58 -> 3;

59 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
2 -> 59 [arrowhead = none ];
59 -> 4;

60 [label="SUCCESS", fontsize=14, style = filled, fillcolor = lightgreen];
3 -> 60 [arrowhead = none ];
60 -> 5;

61 [label="EVAL with clause\nf([], .(X52, X53), X54) :- f(.(X52, X53), X53, X54).\nand substitution\nT1 -> []\nX52 -> T36\nX53 -> T37\nT2 -> .(T36, T37)\nT3 -> T39\nX54 -> T39\nT38 -> T39", fontsize=14, style = filled, fillcolor = lightblue];
4 -> 61 [arrowhead = none ];
61 -> 20;

62 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
4 -> 62 [arrowhead = none ];
62 -> 21;

63 [label="BACKTRACK\nfor clause: f([], .(Head, Tail), RES) :- f(.(Head, Tail), Tail, RES)because of non-unification", fontsize=14, style = filled, fillcolor = white];
5 -> 63 [arrowhead = none ];
63 -> 6;

64 [label="EVAL with clause\nf(.(X11, X12), X13, X14) :- f(X13, X12, X14).\nand substitution\nX11 -> T9\nX12 -> T10\nT5 -> .(T9, T10)\nX13 -> []\nT3 -> T12\nX14 -> T12\nT11 -> T12", fontsize=14, style = filled, fillcolor = lightblue];
6 -> 64 [arrowhead = none ];
64 -> 7;

65 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
6 -> 65 [arrowhead = none ];
65 -> 8;

66 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
7 -> 66 [arrowhead = none ];
66 -> 9;

67 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
9 -> 67 [arrowhead = none ];
67 -> 10;

68 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
9 -> 68 [arrowhead = none ];
68 -> 11;

69 [label="EVAL with clause\nf(X23, [], X23).\nand substitution\nX23 -> []\nT10 -> []\nT12 -> []", fontsize=14, style = filled, fillcolor = lightblue];
10 -> 69 [arrowhead = none ];
69 -> 12;

70 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
10 -> 70 [arrowhead = none ];
70 -> 13;

71 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
11 -> 71 [arrowhead = none ];
71 -> 15;

72 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
11 -> 72 [arrowhead = none ];
72 -> 16;

73 [label="SUCCESS", fontsize=14, style = filled, fillcolor = lightgreen];
12 -> 73 [arrowhead = none ];
73 -> 14;

74 [label="EVAL with clause\nf([], .(X37, X38), X39) :- f(.(X37, X38), X38, X39).\nand substitution\nX37 -> T25\nX38 -> T26\nT10 -> .(T25, T26)\nT12 -> T28\nX39 -> T28\nT27 -> T28", fontsize=14, style = filled, fillcolor = lightblue];
15 -> 74 [arrowhead = none ];
74 -> 17;

75 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
15 -> 75 [arrowhead = none ];
75 -> 18;

76 [label="BACKTRACK\nfor clause: f(.(Head, Tail), Y, RES) :- f(Y, Tail, RES)because of non-unification", fontsize=14, style = filled, fillcolor = white];
16 -> 76 [arrowhead = none ];
76 -> 19;

77 [label="INSTANCE with matching:\nT1 -> .(T25, T26)\nT2 -> T26\nT3 -> T28", fontsize=14, style = filled, fillcolor = lightgrey];
17 -> 77 [arrowhead = none , style=dashed];
77 -> 1[style=dashed];

78 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
20 -> 78 [arrowhead = none ];
78 -> 22;

79 [label="EVAL with clause\nf(.(X128, X129), X130, X131) :- f(X130, X129, X131).\nand substitution\nX128 -> T97\nX129 -> T98\nT1 -> .(T97, T98)\nT2 -> T99\nX130 -> T99\nT3 -> T101\nX131 -> T101\nT100 -> T101", fontsize=14, style = filled, fillcolor = lightblue];
21 -> 79 [arrowhead = none ];
79 -> 43;

80 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
21 -> 80 [arrowhead = none ];
80 -> 44;

81 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
22 -> 81 [arrowhead = none ];
81 -> 23;

82 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
22 -> 82 [arrowhead = none ];
82 -> 24;

83 [label="EVAL with clause\nf(X62, [], X62).\nand substitution\nT36 -> T48\nT37 -> []\nX62 -> .(T48, [])\nT49 -> []\nT39 -> .(T48, [])", fontsize=14, style = filled, fillcolor = lightblue];
23 -> 83 [arrowhead = none ];
83 -> 25;

84 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
23 -> 84 [arrowhead = none ];
84 -> 26;

85 [label="BACKTRACK\nfor clause: f([], .(Head, Tail), RES) :- f(.(Head, Tail), Tail, RES)because of non-unification", fontsize=14, style = filled, fillcolor = white];
24 -> 85 [arrowhead = none ];
85 -> 28;

86 [label="SUCCESS", fontsize=14, style = filled, fillcolor = lightgreen];
25 -> 86 [arrowhead = none ];
86 -> 27;

87 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
28 -> 87 [arrowhead = none ];
87 -> 29;

88 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
28 -> 88 [arrowhead = none ];
88 -> 30;

89 [label="ONLY EVAL with clause\nf(.(X87, X88), X89, X90) :- f(X89, X88, X90).\nand substitution\nT36 -> T68\nX87 -> T68\nT37 -> T69\nX88 -> T69\nX89 -> T69\nT39 -> T71\nX90 -> T71\nT70 -> T71", fontsize=14, style = filled, fillcolor = white];
29 -> 89 [arrowhead = none ];
89 -> 31;

90 [label="FAILURE", fontsize=14, style = filled, fillcolor = lightgreen];
30 -> 90 [arrowhead = none ];
90 -> 41;

91 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
31 -> 91 [arrowhead = none ];
91 -> 32;

92 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
32 -> 92 [arrowhead = none ];
92 -> 33;

93 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
32 -> 93 [arrowhead = none ];
93 -> 34;

94 [label="EVAL with clause\nf(X97, [], X97).\nand substitution\nT69 -> []\nX97 -> []\nT78 -> []\nT71 -> []", fontsize=14, style = filled, fillcolor = lightblue];
33 -> 94 [arrowhead = none ];
94 -> 35;

95 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
33 -> 95 [arrowhead = none ];
95 -> 36;

96 [label="BACKTRACK\nfor clause: f([], .(Head, Tail), RES) :- f(.(Head, Tail), Tail, RES)because of non-unification", fontsize=14, style = filled, fillcolor = white];
34 -> 96 [arrowhead = none ];
96 -> 38;

97 [label="SUCCESS", fontsize=14, style = filled, fillcolor = lightgreen];
35 -> 97 [arrowhead = none ];
97 -> 37;

98 [label="EVAL with clause\nf(.(X110, X111), X112, X113) :- f(X112, X111, X113).\nand substitution\nX110 -> T85\nX111 -> T86\nT69 -> .(T85, T86)\nX112 -> .(T85, T86)\nT71 -> T88\nX113 -> T88\nT87 -> T88", fontsize=14, style = filled, fillcolor = lightblue];
38 -> 98 [arrowhead = none ];
98 -> 39;

99 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
38 -> 99 [arrowhead = none ];
99 -> 40;

100 [label="INSTANCE with matching:\nT1 -> .(T85, T86)\nT2 -> T86\nT3 -> T88", fontsize=14, style = filled, fillcolor = lightgrey];
39 -> 100 [arrowhead = none , style=dashed];
100 -> 1[style=dashed];

101 [label="BACKTRACK\nfor clause: f(.(Head, Tail), Y, RES) :- f(Y, Tail, RES)because of non-unification", fontsize=14, style = filled, fillcolor = white];
41 -> 101 [arrowhead = none ];
101 -> 42;

102 [label="CASE", fontsize=14, style = filled, fillcolor = lightcyan];
43 -> 102 [arrowhead = none ];
102 -> 45;

103 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
45 -> 103 [arrowhead = none ];
103 -> 46;

104 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
45 -> 104 [arrowhead = none ];
104 -> 47;

105 [label="EVAL with clause\nf(X140, [], X140).\nand substitution\nT99 -> T106\nX140 -> T106\nT98 -> []\nT101 -> T106", fontsize=14, style = filled, fillcolor = lightblue];
46 -> 105 [arrowhead = none ];
105 -> 48;

106 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
46 -> 106 [arrowhead = none ];
106 -> 49;

107 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
47 -> 107 [arrowhead = none ];
107 -> 51;

108 [label="PARALLEL", fontsize=14, style = filled, fillcolor = violet];
47 -> 108 [arrowhead = none ];
108 -> 52;

109 [label="SUCCESS", fontsize=14, style = filled, fillcolor = lightgreen];
48 -> 109 [arrowhead = none ];
109 -> 50;

110 [label="EVAL with clause\nf([], .(X154, X155), X156) :- f(.(X154, X155), X155, X156).\nand substitution\nT99 -> []\nX154 -> T119\nX155 -> T120\nT98 -> .(T119, T120)\nT101 -> T122\nX156 -> T122\nT121 -> T122", fontsize=14, style = filled, fillcolor = lightblue];
51 -> 110 [arrowhead = none ];
110 -> 53;

111 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
51 -> 111 [arrowhead = none ];
111 -> 54;

112 [label="EVAL with clause\nf(.(X170, X171), X172, X173) :- f(X172, X171, X173).\nand substitution\nX170 -> T135\nX171 -> T136\nT99 -> .(T135, T136)\nT98 -> T137\nX172 -> T137\nT101 -> T139\nX173 -> T139\nT138 -> T139", fontsize=14, style = filled, fillcolor = lightblue];
52 -> 112 [arrowhead = none ];
112 -> 55;

113 [label="EVAL-BACKTRACK", fontsize=14, style = filled, fillcolor = lightblue];
52 -> 113 [arrowhead = none ];
113 -> 56;

114 [label="INSTANCE with matching:\nT1 -> .(T119, T120)\nT2 -> T120\nT3 -> T122", fontsize=14, style = filled, fillcolor = lightgrey];
53 -> 114 [arrowhead = none , style=dashed];
114 -> 1[style=dashed];

115 [label="INSTANCE with matching:\nT1 -> T137\nT2 -> T136\nT3 -> T139", fontsize=14, style = filled, fillcolor = lightgrey];
55 -> 115 [arrowhead = none , style=dashed];
115 -> 1[style=dashed];

}

(2) Obligation:

Triples:

f1(.(T9, .(T25, T26)), [], T28) :- f1(.(T25, T26), T26, T28).
f1([], .(T68, .(T85, T86)), T88) :- f1(.(T85, T86), T86, T88).
f1(.(T97, .(T119, T120)), [], T122) :- f1(.(T119, T120), T120, T122).
f1(.(T97, T137), .(T135, T136), T139) :- f1(T137, T136, T139).

Clauses:

fc1(T5, [], T5).
fc1(.(T9, []), [], []).
fc1(.(T9, .(T25, T26)), [], T28) :- fc1(.(T25, T26), T26, T28).
fc1([], .(T48, []), .(T48, [])).
fc1([], .(T68, []), []).
fc1([], .(T68, .(T85, T86)), T88) :- fc1(.(T85, T86), T86, T88).
fc1(.(T97, []), T106, T106).
fc1(.(T97, .(T119, T120)), [], T122) :- fc1(.(T119, T120), T120, T122).
fc1(.(T97, T137), .(T135, T136), T139) :- fc1(T137, T136, T139).

Afs:

f1(x1, x2, x3) = f1(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:
f1_in: (b,b,f)
Transforming TRIPLES into the following Term Rewriting System:
Pi DP problem:
The TRS P consists of the following rules:

F1_IN_GGA(.(T9, .(T25, T26)), [], T28) → U1_GGA(T9, T25, T26, T28, f1_in_gga(.(T25, T26), T26, T28))
F1_IN_GGA(.(T9, .(T25, T26)), [], T28) → F1_IN_GGA(.(T25, T26), T26, T28)
F1_IN_GGA([], .(T68, .(T85, T86)), T88) → U2_GGA(T68, T85, T86, T88, f1_in_gga(.(T85, T86), T86, T88))
F1_IN_GGA([], .(T68, .(T85, T86)), T88) → F1_IN_GGA(.(T85, T86), T86, T88)
F1_IN_GGA(.(T97, .(T119, T120)), [], T122) → U3_GGA(T97, T119, T120, T122, f1_in_gga(.(T119, T120), T120, T122))
F1_IN_GGA(.(T97, T137), .(T135, T136), T139) → U4_GGA(T97, T137, T135, T136, T139, f1_in_gga(T137, T136, T139))
F1_IN_GGA(.(T97, T137), .(T135, T136), T139) → F1_IN_GGA(T137, T136, T139)

R is empty.
The argument filtering Pi contains the following mapping:
f1_in_gga(x1, x2, x3) = f1_in_gga(x1, x2)
.(x1, x2) = .(x1, x2)
[] = []
F1_IN_GGA(x1, x2, x3) = F1_IN_GGA(x1, x2)
U1_GGA(x1, x2, x3, x4, x5) = U1_GGA(x1, x2, x3, x5)
U2_GGA(x1, x2, x3, x4, x5) = U2_GGA(x1, x2, x3, x5)
U3_GGA(x1, x2, x3, x4, x5) = U3_GGA(x1, x2, x3, x5)
U4_GGA(x1, x2, x3, x4, x5, x6) = U4_GGA(x1, x2, x3, x4, x6)

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:

F1_IN_GGA(.(T9, .(T25, T26)), [], T28) → U1_GGA(T9, T25, T26, T28, f1_in_gga(.(T25, T26), T26, T28))
F1_IN_GGA(.(T9, .(T25, T26)), [], T28) → F1_IN_GGA(.(T25, T26), T26, T28)
F1_IN_GGA([], .(T68, .(T85, T86)), T88) → U2_GGA(T68, T85, T86, T88, f1_in_gga(.(T85, T86), T86, T88))
F1_IN_GGA([], .(T68, .(T85, T86)), T88) → F1_IN_GGA(.(T85, T86), T86, T88)
F1_IN_GGA(.(T97, .(T119, T120)), [], T122) → U3_GGA(T97, T119, T120, T122, f1_in_gga(.(T119, T120), T120, T122))
F1_IN_GGA(.(T97, T137), .(T135, T136), T139) → U4_GGA(T97, T137, T135, T136, T139, f1_in_gga(T137, T136, T139))
F1_IN_GGA(.(T97, T137), .(T135, T136), T139) → F1_IN_GGA(T137, T136, T139)

(5) DependencyGraphProof (EQUIVALENT transformation)

The approximation of the Dependency Graph [LOPSTR] contains 1 SCC with 4 less nodes.

(6) Obligation:

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

F1_IN_GGA(.(T97, T137), .(T135, T136), T139) → F1_IN_GGA(T137, T136, T139)
F1_IN_GGA(.(T9, .(T25, T26)), [], T28) → F1_IN_GGA(.(T25, T26), T26, T28)
F1_IN_GGA([], .(T68, .(T85, T86)), T88) → F1_IN_GGA(.(T85, T86), T86, T88)

R is empty.
The argument filtering Pi contains the following mapping:
.(x1, x2) = .(x1, x2)
[] = []
F1_IN_GGA(x1, x2, x3) = F1_IN_GGA(x1, x2)

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:

F1_IN_GGA(.(T97, T137), .(T135, T136)) → F1_IN_GGA(T137, T136)
F1_IN_GGA(.(T9, .(T25, T26)), []) → F1_IN_GGA(.(T25, T26), T26)
F1_IN_GGA([], .(T68, .(T85, T86))) → F1_IN_GGA(.(T85, T86), T86)

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:

F1_IN_GGA(.(T97, T137), .(T135, T136)) → F1_IN_GGA(T137, T136)
The graph contains the following edges 1 > 1, 2 > 2
F1_IN_GGA(.(T9, .(T25, T26)), []) → F1_IN_GGA(.(T25, T26), T26)
The graph contains the following edges 1 > 1, 1 > 2
F1_IN_GGA([], .(T68, .(T85, T86))) → F1_IN_GGA(.(T85, T86), T86)
The graph contains the following edges 2 > 1, 2 > 2