 hull
conventions</a>.</p>
<blockquote>
<ul>
    <li><em>input site</em> - a point in the input (one dimension
        lower than a point on the convex hull)</li>
    <li><em>point</em> - a point has <i>d+1</i> coordinates. The
        last coordinate is the sum of the squares of the input
        site's coordinates</li>
    <li><em>coplanar point</em> - a <em>coincident</em>
        input site or a deleted vertex.  Deleted vertices
        indicate highly degenerate input.</li>
    <li><em>vertex</em> - a 