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<p>or more of these is <a href="page.php?w=Empty_set">empty</a>).</p>

<p><big>Definitions</big></p>
<p><big>Interior point</big></p>
<p>If  is a subset of a <a href="page.php?w=Euclidean_space">Euclidean space</a>, then  is an interior point of  if there exists an <a href="page.php?w=open_ball">open ball</a> centered at  which is completely contained in (This is illustrated in the introductory section to this article.)</p>

<p>This definition generalizes to any subset  of a <a href="page.php?w=metric_space">metric space</a>  with metric :  is an interior point of</p><p>
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