; @origtpdbfilename enger-nonloop-isDNat.trs
; @xtcfilename "./TRS_Standard/EEG_IJCAR_12/enger-nonloop-isDNat.xml"
(format TRS)
(fun f 2)
(fun tt 0)
(fun isNat 1)
(fun s 1)
(fun |0| 0)
(rule (f tt x) (f (isNat x) (s (s x))))
(rule (isNat (s x)) (isNat x))
(rule (isNat |0|) tt)