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<p>is , but the best known algorithm is .</p>

<p><big>Independence number and Ramsey theory</big></p>
<p>An <a href="page.php?w=Independent_set_%28graph_theory%29">independent set</a> of  vertices (where  is the <a href="page.php?w=Floor_and_ceiling_functions">floor function</a>) in an n-vertex triangle-free graph is easy to find: either there is a vertex with at least  neighbors (in which case those neighbors are an independent set) or all vertices have strictly less than  neighbors (in which case any <a href="page.php?w=maximal_independent_set">maximal independent set</a></p><p>
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