相关期刊:《Frontiers of Mathematics in China》《Journal of Mathematical Research with Applications》《Science China Mathematics》《Acta Mathematicae Applicatae Sinica》更多>>
This research is supported by the Postdoctoral Fund of China and the K.C.W. Education Fund of HongKong.
A graph G is (a, b)-choosable for nonnegative integers a > b if for any given family {A(v)\v ε V(G)} of sets A(v) of cardinality a there exists a family {B(v)\v ε V(G)} of subsets B(v) A(v) of cardinality b such tha...