Re: siblings

Introduce any order of objects (f.e. age of persons) and include condition in your code:

older(tom, merry).
older(merry, john).
older(john, sally).

is_older(X, Y) :- older(X, Y).
is_older(X, Y) :- is_older(X2, Y), older(X2, Y).

......

sibling( X, Y ) :-
parent_child( Z, X ),
parent_child( Z, Y ),
X \= Y,
is_older(X, Y). // <- here,
// this is problem of order of (X, Y) and (Y, X)

Regards,
Tomasz Budzeń


.

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