G. H. Meisters, Polygons have ears , Amer. Two vertices 5 are adjacent if they are incident to a common edge. A diagonal of a polygon is a line segment that connects two non adjacent vertices and lies entirely in the interior. The restriction of one of these triangulations to the interior face of G is a polygon triangulation. G. H. Meisters.
Polygons have ears .
For years a big open problem was to reduce this complexity by devising better algorithms. Polygons have Ears . Except for triangles every simple polygon has at least two non overlapping ears. A good sub polygon of a simple polygon P, denoted by GSP, is a sub polygon whose boundary differs from that of P in at most one edge. Consider Step 2.