Set: collection of distinct objects, which are called elements
Notation: use of upper case letters to denote sets and lower case to denote elements of a set
Union: if A and B are sets, then the union of them is the set containing all elements of A and B
Intersection: if A and B are sets, the set containing all elements that are in both A and B
Subtraction: A\B to represent the set of all elements of A that are not in B
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Notation: use of upper case letters to denote sets and lower case to denote elements of a set
Union: if A and B are sets, then the union of them is the set containing all elements of A and B
Intersection: if A and B are sets, the set containing all elements that are in both A and B
Subtraction: A\B to represent the set of all elements of A that are not in B
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