# Slack variable

From Encyclopedia of Mathematics

*surplus variable*

A non-negative variable that is introduced for a (linear) constraint in a mathematical programming or linear programming problem to convert this inequality into an equality . If this is done for all inequalities in a linear programming problem, one sometimes speaks of logical variables.

**How to Cite This Entry:**

Slack variable.

*Encyclopedia of Mathematics.*URL: http://encyclopediaofmath.org/index.php?title=Slack_variable&oldid=17975

This article was adapted from an original article by M. Hazewinkel (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article