Certification Problem
Input (TPDB SRS_Standard/Secret_07_SRS/num-515)
The rewrite relation of the following TRS is considered.
|
a(a(a(x1))) |
→ |
b(x1) |
(1) |
|
b(c(x1)) |
→ |
c(c(a(a(a(a(x1)))))) |
(2) |
Property / Task
Prove or disprove termination.Answer / Result
No.Proof (by AProVE @ termCOMP 2023)
1 Looping derivation
There is a looping derivation.
b c a a c c a c c →+ c c c c a c c a a c c a b c a a c c a c c b a
The derivation can be derived as follows.
-
b c →+ c c a a a a:
This is an original rule (OC1).
-
a a a →+ b:
This is an original rule (OC1).
-
b c →+ c c b a:
The overlap closure is obtained from the following two overlap closures (OC3).
-
b c →+ c c a a a a
-
a a a →+ b
-
a a a c →+ c c a a a a:
The overlap closure is obtained from the following two overlap closures (OC2).
-
a a a →+ b
-
b c →+ c c a a a a
-
a a a c →+ c c a b:
The overlap closure is obtained from the following two overlap closures (OC2).
-
a a a c →+ c c a a a a
-
a a a →+ b
-
b c a a c →+ c c b c c a b:
The overlap closure is obtained from the following two overlap closures (OC2).
-
b c →+ c c b a
-
a a a c →+ c c a b
-
b c →+ c c a b:
The overlap closure is obtained from the following two overlap closures (OC2).
-
b c →+ c c a a a a
-
a a a →+ b
-
b c a a c →+ c c c c a b c a b:
The overlap closure is obtained from the following two overlap closures (OC3).
-
b c a a c →+ c c b c c a b
-
b c →+ c c a b
-
b c a →+ c c a a b:
The overlap closure is obtained from the following two overlap closures (OC2).
-
b c →+ c c a a a a
-
a a a →+ b
-
b c a a c →+ c c c c a c c a a b b:
The overlap closure is obtained from the following two overlap closures (OC3).
-
b c a a c →+ c c c c a b c a b
-
b c a →+ c c a a b
-
b c a a c c a →+ c c c c a c c a a b c c a a b:
The overlap closure is obtained from the following two overlap closures (OC2).
-
b c a a c →+ c c c c a c c a a b b
-
b c a →+ c c a a b
-
b c a a c c a →+ c c c c a c c a a c c a b c a a b:
The overlap closure is obtained from the following two overlap closures (OC3).
-
b c a a c c a →+ c c c c a c c a a b c c a a b
-
b c →+ c c a b
-
b c a a c c a c →+ c c c c a c c a a c c a b c a a c c a b:
The overlap closure is obtained from the following two overlap closures (OC2).
-
b c a a c c a →+ c c c c a c c a a c c a b c a a b
-
b c →+ c c a b
-
b c a a c c a c c →+ c c c c a c c a a c c a b c a a c c a c c b a:
The overlap closure is obtained from the following two overlap closures (OC2).
-
b c a a c c a c →+ c c c c a c c a a c c a b c a a c c a b
-
b c →+ c c b a