\input zb-basic
\input zb-ioport
\iteman{io-port 06111998}
\itemau{Kincses, J.; Makay, G.; Mar\'oti, M.; Oszt\'enyi, J.; Z\'adori, L.}
\itemti{A special case of the stahl conjecture.}
\itemso{Eur. J. Comb. 34, No. 2, 502-511 (2013).}
\itemab
Summary: Let $G_{n,k}$ denote the Kneser graph whose vertices are the $n$-element subsets of a $(2n+k)$-element set and whose edges are the disjoint pairs. In this paper we prove that for any non-negative integer $s$ there is no graph homomorphism from $G_{4,2}$ to $G_{4s+1,2s+1}$. This confirms a conjecture of Stahl in a special case.
\itemrv{~}
\itemcc{}
\itemut{Kneser graph; homotopy classes of maps; Kneser's conjecture; graph homomorphism; chromatic number; ortholattice}
\itemli{doi:10.1016/j.ejc.2012.10.003}
\end