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<p>line).</p>

<p>An <b><a href="page.php?w=Ovoid_%28projective_geometry%29">ovoid</a></b> in a <a href="page.php?w=projective_space">projective space</a> is a set   of points such that:<br/>
# Any line intersects   in at most 2 points, <br/>
# The <a href="page.php?w=tangent">tangent</a>s at a point cover a hyperplane (and nothing more), and <br/>
#  contains no lines.</p>

<p>In the finite case only for dimension 3, there exist ovoids. A convenient characterization is:<br/>
*In a <a href="page.php?w=3-dimension">3-dimension</a>al finite projective</p><p>
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