; @xtcfilename "./TRS_Standard/Zantema_15/ex05.xml"
(format TRS)
(fun f 4)
(fun true 0)
(fun s 1)
(fun isNat 1)
(fun double 1)
(fun |0| 0)
(rule (f true true x (s y)) (f (isNat x) (isNat y) (s x) (double (s y))))
(rule (isNat |0|) true)
(rule (isNat (s x)) (isNat x))
(rule (double |0|) |0|)
(rule (double (s x)) (s (s (double x))))