Book drawings of complete bipartite graphs

  • Authors:
  • Etienne De Klerk;Dmitrii V. Pasechnik;Gelasio Salazar

  • Affiliations:
  • -;-;-

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2014

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Abstract

We recall that a book withkpages consists of a straight line (the spine) and k half-planes (the pages), such that the boundary of each page is the spine. If a graph is drawn on a book with k pages in such a way that the vertices lie on the spine, and each edge is contained in a page, the result is a k-page book drawing (or simply a k-page drawing). The page number of a graph G is the minimum k such that G admits a k-page embedding (that is, a k-page drawing with no edge crossings). The k-page crossing number@n"k(G) of G is the minimum number of crossings in a k-page drawing of G. We investigate the page numbers andk-page crossing numbers of complete bipartite graphs. We find the exact page numbers of several complete bipartite graphs, and use these page numbers to find the exactk-page crossing number of K"k"+"1","n for k@?{3,4,5,6}. We also prove the general asymptotic estimate lim"k"-"~lim"n"-"~@n"k(K"k"+"1","n)/(2n^2/k^2)=1. Finally, we give general upper bounds for @n"k(K"m","n), and relate these bounds to the k-planar crossing numbers of K"m","n and K"n.