Multiple vertex coverings by specified induced subgraphs
Abstract
Given graphs H_1,...,H_k, we study the minimum order of a graph G such that for each i, the induced copies of H_i in G cover V(G). We prove a general upper bound of twice the sum of the numbers m_i, where m_i is one less than the order of H_i. When k=2 and one graph is an independent set of size n, we determine the optimum within a constant. When k=2 and the graphs are a star and an independent set, we determine the answer exactly.
 Publication:

arXiv Mathematics eprints
 Pub Date:
 December 1999
 arXiv:
 arXiv:math/9912188
 Bibcode:
 1999math.....12188F
 Keywords:

 Combinatorics;
 05C35;
 05C70
 EPrint:
 10 pages, 3 figures