ositive. </li>
    <li><em>Delaunay region</em> - a
        lower facet projected to the input sites</li>
    <li><em>upper Delaunay region</em> - an upper facet projected
        to the input sites</li>
    <li><em>non-simplicial facet</em> - more than <em>d</em>
        input sites are cocircular or cospherical</li>
    <li><em>good facet</em> - a Delaunay region with optional
        restrictions by '<a href="qh-optq.html#QVn">QVn</a>', etc.</li>
</ul>
</blockquote>
</blockquote>
<h3><a href="#TOP">&#187