What is logical OR symbol? - Definition from WhatIs.com

Definition

logical OR symbol

Part of the Computing fundamentals glossary:

For a practical application, see logic gate .

The logical OR symbol is used in Boolean algebra to indicate an inclusive disjunction between two statements. An inclusive disjunction is true if either, or both, of its components are true. The most commonly used symbol is a plus sign (+).

The simplest use of the OR symbol is with a sentence consisting of two statements. For example, if A represents the statement 'It is raining' and B represents the statement 'It is snowing', then A + B represents the statement 'It is raining or snowing, or both.'

The OR symbol is often found within complex logical statements along with other symbols. In Boolean algebra, negation (also called the NOT operation) is represented by a dash with a 'tail' (¬). The logical AND operation is represented by an asterisk (*). Certain facts involving negation, the OR operation, and the AND operation have been proven in Boolean algebra, and are known as DeMorgan's Laws. According to these theorems, the following pairs of statements are logically equivalent for all A and for all B:

¬(A + B)
(¬A) * (¬B)

¬(A * B)
(¬A) + (¬B)

Also see Mathematical Symbols .

This was last updated in September 2005
Posted by: Margaret Rouse

Related Terms

Definitions

  • lossless and lossy compression

    - Lossless and lossy compression are terms that describe whether or not, in the compression of a file, all original data can be recovered when the file is uncompressed. (WhatIs.com)

  • integration

    - Integration is the act of bringing together smaller components into a single system that functions as one. (SearchCRM.com)

  • middleware

    - Middleware is a general term for software that connects separate, often complex, applications together. (SearchSOA.com)

Glossaries

  • Computing fundamentals

    - Terms related to computer fundamentals, including computer hardware definitions and words and phrases about software, operating systems, peripherals and troubleshooting.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About logical OR symbolPowered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.