Set Theory
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## Set Theory

Intersection

      Intersection (X,Y)

  Returns a set theoretic intersection of X and Y (X and Y are vectors pretending to be sets).

IsIn

      IsIn (x,X)

  Returns `true` if the element x is in the set X (where X is a vector pretending to be a set).

IsSubset

      IsSubset (X, Y)

  Returns `true` if X is a subset of Y (X and Y are vectors pretending to be sets).

MakeSet

      MakeSet (X)

  Returns a vector where every element of X appears only once.

SetMinus

      SetMinus (X,Y)

  Returns a set theoretic difference X-Y (X and Y are vectors pretending to be sets).

Union

      Union (X,Y)

  Returns a set theoretic union of X and Y (X and Y are vectors pretending to be sets).

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