Semidefinite Programming and Ramsey Numbers
Semidefinite Programming and Ramsey Numbers
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DOI:
10.1137/18m1169473
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发表时间:
2017-04
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通讯作者:
Bernard Lidick'y;Florian Pfender
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作者:
Bernard Lidick'y;Florian Pfender
We use the theory of flag algebras to find new upper bounds for several small graph and hypergraph Ramsey numbers. In particular, we prove the exact values $R(K_4^-,K_4^-,K_4^-)=28$, $R(K_8,C_5)= 29$, $R(K_9,C_6)= 41$, $R(Q_3,Q_3)=13$, $R(K_{3,5},K_{1,6})=17$, $R(C_3, C_5, C_5)= 17$, and $R(K_4^-,K_5^-;3)= 12$, and in addition improve many additional upper bounds.