Walking through the datalog tutorial I got the following transcript: Welcome to DrRacket, version 6.12 [3m]. Language: datalog, with debugging; memory limit: 512 MB. > parent(john, douglas). > parent(john, douglas)? parent(john, douglas). > parent(john, evlyn)?
> parent(bob, john). > parent(A, B)? parent(john, douglas). parent(bob, john). > parent(ebbon, bob). > parent(john, B)? parent(john, douglas). > parent(A, A)? > ancestor(A, B) :- parent(A, B). > ancestor(A, B) :- parent(A, C), parent(C, B). > ancestor(A, B)? ancestor(ebbon, bob). ancestor(bob, john). ancestor(john, douglas). ancestor(bob, douglas). ancestor(ebbon, john). > It seems that the correct answer should also include ancestor(ebbon, douglas). Am I doing something wrong? -Kevin -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
