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Reference.org
Relative convex hull
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<p>In <a href="/facts/Discrete_geometry/Ixnl3GBc">discrete geometry</a> and <a href="/facts/Computational_geometry/eeaotQtl">computational geometry</a>, the relative convex hull or geodesic convex hull is an analogue of the <a href="/facts/Convex_hull/D4Id3JDS">convex hull</a> for the points inside a <a href="/facts/Simple_polygon/C5CfrPWf">simple polygon</a> or a <a href="/facts/Rectifiable_set/nylBklGT">rectifiable</a> <a href="/facts/Simple_closed_curve/zKpty4QT">simple closed curve</a>. </p>