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<p>(number of steps needed to reach any vertex from any other vertex). Additionally, many computer scientists use the phrase "polyhedral combinatorics" to describe research into precise descriptions of the faces of certain specific polytopes (especially 0-1 polytopes, whose vertices are subsets of a <a href="page.php?w=hypercube">hypercube</a>) arising from <a href="page.php?w=integer_programming">integer programming</a> problems.</p>

<p><big>Faces and face-counting vectors</big></p>
<p>A face of a convex polytope P may be defined as the intersection of</p><p>
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