ment zone.
Here each target corresponds to a single feature and can be met through
the total amount of habitat in planning units present to the three
zones.</p>
    </div>
    <div class="section level2">
    <h2 id="mathematical-formulation">Mathematical formulation<a class="anchor" aria-label="anchor" href="#mathematical-formulation"></a></h2>


<p>This objective can be expressed mathematically for a set of planning units
(\(I\) indexed by \(i\)) and a set of features (\(J\)
indexed by \(j\)) as:</p>
<p>$