English

On the Vertex Folkman Numbers $F_v(2,...,2;q)$

Combinatorics 2009-03-24 v1

Abstract

For a graph GG the symbol G\tov(a1,...,ar)G\tov(a_1,...,a_r) means that in every rr-coloring of the vertices of GG for some i{1,...,r}i\in\{1,...,r\} there exists a monochromatic aia_i-clique of color ii. The vertex Folkman numbers \FN=min{V(G):G\tov(a1,...,ar)andKqG} \FN=\min\{|V(G)|:G\tov(a_1,...,a_r)\text{and}K_q\nsubseteqq G\} are considered. In this paper we shall compute the Folkman numbers Fv(2,...,2r;rk+1)F_v(\underbrace{2,...,2}_r;r-k+1) when k12k\le 12 and rr is sufficiently large. We prove also new bounds for some vertex and edge Folkman numbers.

Keywords

Cite

@article{arxiv.0903.3812,
  title  = {On the Vertex Folkman Numbers $F_v(2,...,2;q)$},
  author = {N. Nenov},
  journal= {arXiv preprint arXiv:0903.3812},
  year   = {2009}
}

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21 pages