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# Sets

TermDefinition
Sets A group of things that have a certain property in common e.g. even numbers 2 4 6 8 10
An element The numbers or objects in a set are called the elements
Cardinal Number # This is the number of numbers within a set. For example Set A has 5 numbers{1,2,3,4,5} and Set B has 3 numbers {2,4,6}
Prime Number This is any number that can be divided by itself and 1 only. Example {2, 3, 5, ...}
Null Set This is a set that has no elements. It is given the symbol {}
Subset When given two sets A and B. If all of the elements of B are also in A, then B is said to be a subset of A. Example Set A {1,2,3,4,5,6,7} and Set B {1,2,3,4,5}; B is a subset of A.
Union of two sets The set of elements contained in both sets
Intersection of two sets The set of elements common to both sets
Universal Set The set that contains all elements
Complement of Set A List all of the elements of the universal set except set A. In other words, all of the elements outside Set A.
A\B This is the set of elements in A but not in B. In other words list A without B.
Created by: Clare Mahon