Functions that are going to be used in core logic must return goals. (defn parents-of [m f c] > (parent m c) > (parent f c) > (!= m f)) >
In this case you only return the (!= m f) subgoal instead of the goal that represents the conjunction of all three subgoals. (defn parents-of [m f c] (all (parent m c) (parent f c) (!= m f))) Is probably what you want. Untested. David -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en