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<p>of polytopes; for instance, they seek <a href="page.php?w=inequality_%28mathematics%29">inequalities</a> that describe the relations between the numbers of <a href="page.php?w=vertex_%28geometry%29">vertices</a>, <a href="page.php?w=edge_%28geometry%29">edges</a>, and faces of higher dimensions in arbitrary polytopes or in certain important subclasses of polytopes, and study other combinatorial properties of polytopes such as their <a href="page.php?w=Connectivity_%28graph_theory%29">connectivity</a> and <a href="page.php?w=diameter">diameter</a></p><p>
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