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<p>which asks whether a given graph G contains a subgraph that is isomorphic to another given graph H; this problem is known to be NP-complete. It is also known to be a special case of the <a href="page.php?w=Abelian_group">non-abelian</a> <a href="page.php?w=hidden_subgroup_problem">hidden subgroup problem</a> over the <a href="page.php?w=symmetric_group">symmetric group</a>.</p>

<p>In the area of <a href="page.php?w=image_recognition">image recognition</a> it is known as the <b>exact graph matching problem</b>.</p>

<p><big>State of the art</big></p>
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