1.   SET:   A collection of things.

2.	ELEMENT:	An element is MEMBER of a SET.   It is denoted by the symbol
		If something is NOT AN ELEMENT of a ser we use the symbol

  3.   The NOTATION for sets are BRACES, {  }

Example:  {Jan., Feb., Mar.}    The set of the first three months of the year.

Example:  {a, e, i, o, u}              The set of the vowels in the English language.

  4.   CAPITAL letters are used to name a set: 

Example:  A  =  {Jan., Feb., Mar.}
                    B  =  {a, e, i, o, u}

  5.   SUBSET:  If every element in a given set B is also an element of a set A, then B is a
                            SUBSET of A.

	Example:	BA  means "B is a SUBSET of A." If H  =  {1, 2, 3, 4, 5, 6} and K  =  {2, 4, 6} then K H
	Note 1	If there is at least one element of B that is not in A then B is NOT A SUBSET of A. This is written BA
	Example:	If H = {1, 2, 3, 4, 5, 6} and M = {5, 7, 9} then MH
	Note 2	Every set is a subset of itself.

   6.   The NULL or EMPTY SET is a set which contains NO ELEMENTS.
         The symbol for the empty set is f the Greek letter Phi or we may just  write {  }.

discussion.  The symbol for the UNIVERSAL SET is

  8.   The COMPLEMENT of a set A is the set of all elements in the UNIVERSAL SET
         which are NOT in the set A.

        The COMPLEMENT of a set is denoted as A' and can be read as "A complement,"
        "the complement of A," or "A prime."

Example:

If U = {a, e, i, o, u} and A = {a, i, u} then A' = {e, o}, since the elements"e" and "o" are the only elements that are NOT in A but yet are in the Universal Set U.

  9.    The UNION of sets A and B, AB, is the set containing all the 
         elements that are members of set A OR set B. 

10.  The INTERSECTION of two sets A and B,  AB , is the set containing
        all the elements that are common to BOTH sets A AND set B. 

Below is an example of UNION and INTERSECTION using the following sets: 

   =  {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} 
  A  =  {1, 2, 4, 6} 
  B  =  {1, 3, 6, 7, 9} 
  C =   {  }