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 Set operators


   Operator Operation    Operand types
   +        Union        compatible set types
   -        Difference   compatible set types
   *        Intersection compatible set types

The results of set operations conform to the rules of set logic:

  - An ordinal value C is in A  +  B only if C is in A or B.
  - An ordinal value C is in A  -  B only if C is in A and not in B.
  - An ordinal value C is in A  *  B only if C is in both A and B.

If the smallest ordinal value that is a member of the result of a set operation is A and the largest is B, the type of the result is set of A..B.

 
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Тэги: Operators + - Sets
 

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