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Two ears theorem
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the two ears theorem states that every <a href="/facts/Simple_polygon/C5CfrPWf">simple polygon</a> with more than three vertices has at least two <a href="/facts/Ear_(mathematics)/ID3cea9z">ears</a>, vertices that can be removed from the polygon without introducing any crossings. The two ears theorem is equivalent to the existence of <a href="/facts/Polygon_triangulation/FF0205ye">polygon triangulations</a>. It is frequently attributed to Gary H. Meisters, but was proved earlier by <a href="/facts/Max_Dehn/4x7x0CM0">Max Dehn</a>. </p>