; @author Raul Gutierrez
; @author Salvador Lucas
; @doi 10.1007/3-540-45744-5_49
; @cops 923
; [153] Example 21
(format TRS :problem infeasibility)
(fun F 2)
(fun a 0)
(fun b 0)
(fun f 2)
(fun g 2)
(fun h 1)
(rule (g a y) y)
(rule (f x a) (f x (g x b)))
(rule (g (h x) y) (g x (h y)))
(infeasible? (= (F x (g x b)) (F y a)))