/home/nowonder/forschung/aprove/TPDB05/TRS/SK90/4.15.trs

The program

(VAR x y z)
(RULES
+(-(x,y),z) -> -(+(x,z),y)
-(+(x,y),y) -> x
)
(COMMENT Example 4.15 (Addition and Substraction) in \cite{SK90})