# Logical OR

Type classification: this is a lesson resource. |

Welcome! This is a lesson in the Introductory Discrete Mathematics for Computer Science course here at Wikiversity.

Previous lesson: Logical AND

## The Disjunction edit

I apologize for the name of this lesson. The true name of this operator, which is a diadic operator, is a **disjunction**. It is sometimes called the **inclusive OR operator**, to distinguish it from another operator you'll learn about later. However, it is a bit dangerous to refer to a disjunction as an OR operator, because English words are far more vague than logic.

: This is the disjunction, a.k.a. the (inclusive) OR operator

- Let represent the statement: It is raining.
- Let represent the statement: I am hungry.
- represents the disjunction of statements and : It is raining OR I am hungry (OR it is raining AND I am hungry).

## Truth Table for the Disjunction edit

This is its truth table:

T | T | T |

T | F | T |

F | T | T |

F | F | F |

## Next Lesson edit

The name of the next lesson is Logical XOR.