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<a accesskey="3" href="page.php?w=perturbation_function&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=mathematical_optimization">mathematical optimization</a>, the <b>perturbation function</b> is any <a href="page.php?w=function_%28mathematics%29">function</a> which relates to primal and <a href="page.php?w=dual_problem">dual problem</a>s.  The name comes from the fact that any such function defines a perturbation of the initial problem.  In many cases this takes the form of shifting the constraints.</p>

<p>In some texts the <a href="page.php?w=value_function">value function</a> is called the perturbation function, and</p><p>
<a accesskey="3" href="page.php?w=perturbation_function&amp;p=2">3.Next</a>
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