The number of edges of many faces in a line segment arrangement

Boris Aronov, Herbert Edelsbrunner, Leonidas J. Guibas, Micha Sharir

Abstract: We show that the maximum number of edges boundingm faces in an arrangement ofn line segments in the plane isO(m 2/3 n 2/3+nα(n)+nlogm). This improves a previous upper bound of Edelsbrunner et al. [5] and almost matches the best known lower bound which is Ω(m 2/3 n 2/3+nα(n)). In addition, we show that the number of edges bounding anym faces in an arrangement ofn line segments with a total oft intersecting pairs isO(m 2/3 t 1/3+nα(t/n)+nmin{logm,logt/n}), almost matching the lower bound of Ω(m 2/3 t 1/3+nα(t/n)) demonstrated in this paper.