Sets

• The three dots ... are called an ellipsis, and mean "continue on".
• A set is any collection of objects.
• Two sets are equal if they have precisely the same members.
• if we take pieces of that set, we can form what is called a subset.
• a set with no elements is called Empty set (or Null set)
• When we say order in sets we mean the size of the set aka cardinality