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# Sets

Term | Definition |
---|---|

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