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<p>seen to be<br/>
:</p>

<p><big> Fenchel duality </big></p>
<p>Let  and  be dual pairs.  Assume there exists a <a href="page.php?w=linear_map">linear map</a>  with <a href="page.php?w=adjoint_operator">adjoint operator</a> . Assume the primal <a href="page.php?w=objective_function">objective function</a>  (including the constraints by way of the indicator function) can be written as  such that .  Then the perturbation function is given by<br/>
: </p>

<p>In particular if the primal objective is  then the perturbation function is given by , which is the</p><p>
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