SOLUTION: define sets which is are equal equevalent, joint and disjoint?

define sets which is are equal equevalent, joint and disjoint?

1. Sets are equal if they contain exactly the same members or elements

    {1,3,8,4} is equal to {8,1,4,3}

2. Sets are equivalent if they contain the same NUMBER of members 
   or elements but not necessarily the same members or elements.

    (1,3,8,4} is equivalent to {7,8,5,1}

3. Sets are joint if they contain at least one element in common.

   {1,3,8,4} and {3,9,1,7} are joint sets.

4. Sets are disjoint if they have no member or element in common.

   (1,3,8,4} and (2,4,7,5} are disjoint sets.

Edwin