Christian   Reiher

Note on a conjecture concerning spanning subgraphs with degree constraints

Preprint series:   Preprints aus dem Institut für Mathematik, Universität Rostock

MSC: 05C07   Degree sequences
  05C15   Coloring of graphs and hypergraphs

Abstract:   In this brief note, we give a positive answer to a question that has recently been asked by L.~Addario--Berry et al. in this journal, namely: Given a graph $G=(V,E)$ and for every vertex $v\in V$ a list \hbox{$D_v\subseteq\{0,1,\ldots, d(v)\}$} satisfying $|D_v|\geqq\fraq{d(v)}2+1$, does there necessarily exist a spanning subgraph $H$ of $G$ such that $d_H(v)\in D_v$ holds for every $v\inV$?

Keywords:   Louigi's Conjecture, Degree-constrained subgraphs, Combinatorial Nullstellensatz.

karin.martin@uni-rostock.de
Seite generiert am 01.12.2008,   09:46   Uhr