Let Tn denote a tree of order n and Wm a wheel of order m+1. In this paper,we determine the Ramsey numbers R(Tn W6) for Tn without certain deletable sets.
文摘Let Tn denote a tree of order n and Wm a wheel of order m+1. In this paper,we determine the Ramsey numbers R(Tn W6) for Tn without certain deletable sets.