# Variable

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Look up ***[Variable](https://en.wiktionary.org/wiki/Variable)***, ***[variable](https://en.wiktionary.org/wiki/variable)***, or ***[variables](https://en.wiktionary.org/wiki/variables)*** in Wiktionary, the free dictionary.

Wikiversity has learning resources about ***[Variable](https://en.wikiversity.org/wiki/Special:Search/Variable)***

**Variable** may refer to:

- [Variable (computer science)](/source/Variable_(computer_science)), a symbolic name associated with a value and whose associated value may be changed

- [Variable (mathematics)](/source/Variable_(mathematics)), a symbol that represents a quantity in a mathematical expression, as used in many sciences

## Mathematics

- [Propositional variable](/source/Propositional_variable), taking the value true or false in mathematical logic

- [Random variable](/source/Random_variable), a variable in statistics whose value depends on random events - [Categorical variable](/source/Categorical_variable), taking one of a finite number of values in a statistical problem, such as the head or tail result of a tossed coin - [Independent and identically distributed random variables](/source/Independent_and_identically_distributed_random_variables), statistically independent and having the same probability distribution

- [Fluent (mathematics)](/source/Fluent_(mathematics)), a time-varying quantity as coined by Isaac Newton in his early calculus

- [State variable](/source/State_variable), used to describe the mathematical "state" of a dynamical system

- [Slack variable](/source/Slack_variable), inserted to transform an inequality constraint in an optimization problem into an equality

- [Dependent and independent variables](/source/Dependent_and_independent_variables), a variable classified according to whether or not it depends for its value on another variable of interest

- [Free variables and bound variables](/source/Free_variables_and_bound_variables), restricted or otherwise to a specified set of values, such as through a logical quantifier

- Complex variable, the argument or value of a function of a complex number in [complex analysis](/source/Complex_analysis)

## Physical and social sciences

- [Variable (research)](/source/Variable_(research)), a logical set of attributes

- [Control variable](/source/Control_variable), a measurable entity which is constant (controlled) and unchanged throughout the course of a scientific experiment

- [Variable star](/source/Variable_star), a type of astronomical star

## Other uses

- "[The Variable](/source/The_Variable)", an episode of the television series *[Lost](/source/Lost_(2004_TV_series))*

## See also

- [Hidden variable (disambiguation)](/source/Hidden_variable_(disambiguation))

- [Variability (disambiguation)](/source/Variability_(disambiguation))

- [Variance (disambiguation)](/source/Variance_(disambiguation))

Topics referred to by the same term

This [disambiguation](https://en.wikipedia.org/wiki/Help:Disambiguation) page lists  articles associated with the title **Variable**.
If an [internal link](https://en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Variable&namespace=0) incorrectly led you here, you may wish to change the link to point directly to the intended article.

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Adapted from the Wikipedia article [Variable](https://en.wikipedia.org/wiki/Variable) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Variable?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.