摘要:
研究素数阶完全图分解为循环图的方法,给出计算它的子图的团数的一种算法,得到3个三色,4个四色Ramsey数的新的下界:R(3, 4, 18)≥450, R(3, 4, 19)≥464, R(3, 4, 20)≥522, R(3, 3, 5, 10)≥542, R(3, 3, 5, 11)≥618, R(3, 4, 5, 16)≥1 410, R(3, 4, 5, 17)≥1 430.
关键词:
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Ramsey数
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下界
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循环图
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算法
Abstract:
The method that prime order complete graphs are vesolved into some circulant graphs is studied.An algorithm for computing clique numbers of subgraphs of the complete graph is developed.New lower bounds of three 3-color and for 4-color Ramsey numbers were obtained:R(3, 4, 18)≥450, R(3, 4, 19)≥464, R(3, 4, 20)≥522, R(3, 3, 5, 10)≥542, R(3, 3, 5, 11)≥618, R(3, 4, 5, 16)≥1 410, R(3, 4, 5, 17)≥1 430.