Certification Problem

Input (TPDB SRS_Standard/Waldmann_19/random-466)

The rewrite relation of the following TRS is considered.

a(a(b(a(x1)))) a(b(b(a(x1)))) (1)
b(a(b(b(x1)))) b(b(a(b(x1)))) (2)
b(a(b(a(x1)))) b(b(a(a(x1)))) (3)

Property / Task

Prove or disprove termination.

Answer / Result

Yes.

Proof (by NaTT @ termCOMP 2023)

1 Dependency Pair Transformation

The following set of initial dependency pairs has been identified.
b#(a(b(b(x1)))) b#(a(b(x1))) (4)
b#(a(b(a(x1)))) a#(a(x1)) (5)
a#(a(b(a(x1)))) a#(b(b(a(x1)))) (6)
b#(a(b(a(x1)))) b#(a(a(x1))) (7)
b#(a(b(b(x1)))) a#(b(x1)) (8)
b#(a(b(b(x1)))) b#(b(a(b(x1)))) (9)
a#(a(b(a(x1)))) b#(b(a(x1))) (10)
b#(a(b(a(x1)))) b#(b(a(a(x1)))) (11)

1.1 Dependency Graph Processor

The dependency pairs are split into 1 component.