Logical OR

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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.