On a Problem of Ahlswede and Katona

Document Type

Article

Publication Date

7-4-2009

Publication Title

Studia Scientiarum Mathematicarum Hungarica

DOI

10.1556/SScMath.2009.1107

ISSN

1588-2896

Abstract

Let p ( G ) denote the number of pairs of adjacent edges in a graph G . Ahlswede and Katona considered the problem of maximizing p ( G ) over all simple graphs with a given number n of vertices and a given number N of edges. They showed that p ( G ) is either maximized by a quasi-complete graph or by a quasi-star. They also studied the range of N (depending on n ) for which the quasi-complete graph is superior to the quasi-star (and vice versa) and formulated two questions on distributions in this context. This paper is devoted to the solution of these problems.

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