Certification Problem

Input (COPS 149)

We consider the TRS containing the following rules:

-(+(x,y)) +(-(x),-(y)) (1)
+(x,y) +(y,x) (2)

The underlying signature is as follows:

{-/1, +/2}

Property / Task

Prove or disprove confluence.

Answer / Result

Yes.

Proof (by ACP @ CoCo 2021)

1 Strongly closed

Confluence is proven since the TRS is strongly closed. The joins can be performed using 3 step(s).