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17 Apr 2012, 03:17
0001_square_pragsmall

David Lindelöf (12 posts)

Reading the coloring problem in Prolog, I was wondering whether it would be possible to tell Prolog that if different(red,green) then one could infer that different(green,red).

However, I tried defining the rule that different(A,B) :- different(B,A), but running the program then never terminates.

How could I define such a rule?
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