2.  A set is a collection of objects …

3.  Each object in a set is called an element…

4.  “U is an element of the periodic table” (dat be some good grammer)

5.  A set can be notated in three different ways:

6.  1) a description of the set… “The Periodic Table of Elements”

7.  2) Roster notation (a list of all elements in the set)… {Hydrogen, Helium, Lithium,…}

8.  3) Set-builder notation (a specific format for describing a set)… {x|x is an element in the periodic table}

9.  The number of unique elements in a set is called its Cardinality  Skdjfhs = 118 ish The order of the elements is unimportant

10.  Sets can be empty... { } or contain no elements (“the empty set”) Sets can also be infinite… (more about that later!)

11.  Two sets that have the same elements are equal… =

12.  Two sets that have the same number of elements are equivalent…  xjbvz Is Equivalent To

13.  Welcome to  Let the games begin!