TY - JOUR
T1 - Choosability and fractional chromatic numbers
AU - Alon, N.
AU - Tuza, Zs
AU - Voigt, M.
N1 - Funding Information:
*Corresponding author. E-mail: [email protected]. ’ Research supported in part by the Fund for Basic Research administered by the Israel Academy of Sciences. * Research supported in part by the National Scientific Research Fund, grants 7558 and T016416.
PY - 1997/3/15
Y1 - 1997/3/15
N2 - A graph G is (a,b)-choosable if for any assignment of a list of a colors to each of its vertices there is a subset of b colors of each list so that subsets corresponding to adjacent vertices are disjoint. It is shown that for every graph G, the minimum ratio a/b where a,b range over all pairs of integers for which G is (a,b)-choosable is equal to the fractional chromatic number of G.
AB - A graph G is (a,b)-choosable if for any assignment of a list of a colors to each of its vertices there is a subset of b colors of each list so that subsets corresponding to adjacent vertices are disjoint. It is shown that for every graph G, the minimum ratio a/b where a,b range over all pairs of integers for which G is (a,b)-choosable is equal to the fractional chromatic number of G.
UR - http://www.scopus.com/inward/record.url?scp=0002443622&partnerID=8YFLogxK
U2 - 10.1016/S0012-365X(96)00159-8
DO - 10.1016/S0012-365X(96)00159-8
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AN - SCOPUS:0002443622
SN - 0012-365X
VL - 165-166
SP - 31
EP - 38
JO - Discrete Mathematics
JF - Discrete Mathematics
ER -