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Upper Bounds for Some Ramsey Numbers \(R(3,k)\)

STANISEAW P. RADZISZOWSKI1, DONALD L. KREHER1
1School of Computer Science and Technology Rochester Institute of Technology Rochester, NY 14623

Abstract

Using several computer algorithms, we calculate some values and bounds for the function \(e(3,k,n)\), the minimum number of edges in a triangle-free graph on \(n\) vertices with no independent set of size \(k\). As a consequence, the following new upper bounds for the classical two-color Ramsey numbers are obtained:
\(R(3,10) \leq 43\), \(\quad\)
\(R(3,11) \leq 51\), \(\quad\)
\(R(3,12) \leq 60\), \(\quad\)
\(R(3,13) \leq 69\) \(\quad\) and
\(R(3,14) \leq 78\).