Termination Proof Script

Consider the TRS R consisting of the rewrite rules
1:    active(2nd(cons(X,cons(Y,Z))))  → mark(Y)
2:    active(from(X))  → mark(cons(X,from(s(X))))
3:    active(2nd(X))  → 2nd(active(X))
4:    active(cons(X1,X2))  → cons(active(X1),X2)
5:    active(from(X))  → from(active(X))
6:    active(s(X))  → s(active(X))
7:    2nd(mark(X))  → mark(2nd(X))
8:    cons(mark(X1),X2)  → mark(cons(X1,X2))
9:    from(mark(X))  → mark(from(X))
10:    s(mark(X))  → mark(s(X))
11:    proper(2nd(X))  → 2nd(proper(X))
12:    proper(cons(X1,X2))  → cons(proper(X1),proper(X2))
13:    proper(from(X))  → from(proper(X))
14:    proper(s(X))  → s(proper(X))
15:    2nd(ok(X))  → ok(2nd(X))
16:    cons(ok(X1),ok(X2))  → ok(cons(X1,X2))
17:    from(ok(X))  → ok(from(X))
18:    s(ok(X))  → ok(s(X))
19:    top(mark(X))  → top(proper(X))
20:    top(ok(X))  → top(active(X))
There are 32 dependency pairs:
21:    ACTIVE(from(X))  → CONS(X,from(s(X)))
22:    ACTIVE(from(X))  → FROM(s(X))
23:    ACTIVE(from(X))  → S(X)
24:    ACTIVE(2nd(X))  → 2nd#(active(X))
25:    ACTIVE(2nd(X))  → ACTIVE(X)
26:    ACTIVE(cons(X1,X2))  → CONS(active(X1),X2)
27:    ACTIVE(cons(X1,X2))  → ACTIVE(X1)
28:    ACTIVE(from(X))  → FROM(active(X))
29:    ACTIVE(from(X))  → ACTIVE(X)
30:    ACTIVE(s(X))  → S(active(X))
31:    ACTIVE(s(X))  → ACTIVE(X)
32:    2nd#(mark(X))  → 2nd#(X)
33:    CONS(mark(X1),X2)  → CONS(X1,X2)
34:    FROM(mark(X))  → FROM(X)
35:    S(mark(X))  → S(X)
36:    PROPER(2nd(X))  → 2nd#(proper(X))
37:    PROPER(2nd(X))  → PROPER(X)
38:    PROPER(cons(X1,X2))  → CONS(proper(X1),proper(X2))
39:    PROPER(cons(X1,X2))  → PROPER(X1)
40:    PROPER(cons(X1,X2))  → PROPER(X2)
41:    PROPER(from(X))  → FROM(proper(X))
42:    PROPER(from(X))  → PROPER(X)
43:    PROPER(s(X))  → S(proper(X))
44:    PROPER(s(X))  → PROPER(X)
45:    2nd#(ok(X))  → 2nd#(X)
46:    CONS(ok(X1),ok(X2))  → CONS(X1,X2)
47:    FROM(ok(X))  → FROM(X)
48:    S(ok(X))  → S(X)
49:    TOP(mark(X))  → TOP(proper(X))
50:    TOP(mark(X))  → PROPER(X)
51:    TOP(ok(X))  → TOP(active(X))
52:    TOP(ok(X))  → ACTIVE(X)
The approximated dependency graph contains 7 SCCs: {32,45}, {33,46}, {34,47}, {35,48}, {37,39,40,42,44}, {25,27,29,31} and {49,51}. Hence the TRS is terminating.
Tyrolean Termination Tool  (2.29 seconds)   ---  May 3, 2006