##
k-Quasi-Planar Graphs

A topological graph is k-quasi-planar if it does not contain k pairwise crossing edges. A topological graph is simple if every pair of its edges intersect at most once (either at a vertex or at their intersection). In 1996, Pach, Shahrokhi. and Szegedy [16] showed that every n-vertex simple k-quasi-planar graph contains at most O(n(log n)(2k-4)) edges. This upper bound was recently improved (for large k) by Fox and Pach [8] to n(log n)(O(log k)). In this note, we show that all such graphs contain at most (n log(2) n)2(alpha ck(n)) edges, where alpha(n) denotes the inverse Ackermann function and c(k) is a constant that depends only on k.

Published in:

Graph Drawing, 7034, 266-277

Presented at:

19th Symposium on Graph Drawing, Eindhoven, NETHERLANDS, SEP 21-23, 2011

Publisher:

Berlin, Springer-Verlag Berlin

ISSN:

0302-9743

ISBN:

978-3-642-25877-0

Laboratories:

Record created 2013-02-27, last modified 2018-09-13