; @author Raul Gutierrez
; @author Salvador Lucas
; @doi 10.1007/3-540-45744-5_49
; @cops 921
; [153] Example 14
(format TRS :problem infeasibility)
(fun F 2)
(fun a 0)
(fun b 0)
(fun f 2)
(rule (f x x) (f a b))
(infeasible? (= (F a b) (F x x)))