Casper <[email protected]> writes:
> For me that leads to the question, how do we then define the relationship
> 'descendant' (which would be the generalisation of child, grandchild etc)?
>
> (defn child [x y]
> (parent y x))
Ok, so you have a `child' relation already, so this should be easy (but
it's not tested):
(defn descendant [d a]
(conde
[(child d a)]
[(fresh [p]
(child d p)
(descendant p a))]))
So d is a descendant of a if
- d is a child of a, or
- there is some p who is the parent of d and a descendant of a.
I think instead of `conde' you can use `conda' here, because when the
first clause succeeds the second one cannot succeed and doesn't need to
be tested.
Bye,
Tassilo
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