The Triangle-Free Process and the Ramsey Number R(3,k)

Gonzalo Fiz Pontiveros · Simon Griffiths · Robert Morris

abr 2020 · American Mathematical Soc.

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The areas of Ramsey theory and random graphs have been closely linked ever since Erdős's famous proof in 1947 that the “diagonal” Ramsey numbers R(k) grow exponentially in k. In the early 1990s, the triangle-free process was introduced as a model which might potentially provide good lower bounds for the “off-diagonal” Ramsey numbers R(3,k). In this model, edges of Kn are introduced one-by-one at random and added to the graph if they do not create a triangle; the resulting final (random) graph is denoted Gn,△. In 2009, Bohman succeeded in following this process for a positive fraction of its duration, and thus obtained a second proof of Kim's celebrated result that R(3,k)=Θ(k2/logk).

In this paper the authors improve the results of both Bohman and Kim and follow the triangle-free process all the way to its asymptotic end.

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Instituto Nacional de Matemática Pura e Aplicada (IMPA), Rio de Janeiro, Brasil

Instituto Nacional de Matemática Pura e Aplicada (IMPA), Rio de Janeiro, Brasil

Instituto Nacional de Matemática Pura e Aplicada (IMPA), Rio de Janeiro, Brasil