Certification Problem
Input (TPDB TRS_Standard/Strategy_removed_mixed_05/n001)
The rewrite relation of the following TRS is considered.
|
h(f(f(x))) |
→ |
h(f(g(f(x)))) |
(1) |
|
f(g(f(x))) |
→ |
f(f(x)) |
(2) |
Property / Task
Prove or disprove termination.Answer / Result
No.Proof (by ttt2 @ termCOMP 2023)
1 Loop
The following loop proves nontermination.
| t0
|
= |
h(f(f(x8))) |
|
→
|
h(f(g(f(x8)))) |
|
→
|
h(f(f(x8))) |
|
= |
t2
|
where t2 =
t0σ
and
σ =
{x8/x8}