Commits

Yujie Wu committed c662bc2

Added a `subset' rule for the set data structure.

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Files changed (1)

 
 
 
+% Subset
+% True if the first set is a subset of the second one.
+subset( [],            _          ).
+subset( [Elem | Tail], [E    | T] ) :- Elem  > E, subset( [Elem | Tail], T ).
+subset( [Elem | Tail], [Elem | T] ) :-            subset(         Tail,  T ).
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