Certification Problem
Input (TPDB TRS_Standard/HirokawaMiddeldorp_04/n007)
The rewrite relation of the following TRS is considered.
|
f(x,y) |
→ |
f(x,x) |
(1) |
|
f(s(x),y) |
→ |
f(y,x) |
(2) |
Property / Task
Prove or disprove termination.Answer / Result
No.Proof (by ttt2 @ termCOMP 2023)
1 Loop
The following loop proves nontermination.
| t0
|
= |
f(x,y) |
|
→
|
f(x,x) |
|
= |
t1
|
where t1 =
t0σ
and
σ =
{y/x, x/x}