Surplus variable

In an inequality constraint of the form g(x) >= b, the level of surplus is g(x)-b, which is designated by the surplus variable, s. Then, the original constraint is equivalent to the defining equation, g(x) - s = b, plus the non-negativity, s >= 0.
Found on http://glossary.computing.society.informs.org/index.php?page=S.html
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