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arXiv · 2207.06505

Fraisse structures with SDAP+, Part II: Simply characterized big Ramsey structures

Rebecca Coulson·Natasha Dobrinen·Rehana Patel
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Abstract

This is Part II of a two-part series regarding Ramsey properties of Fraisse structures satisfying a property called SDAP+, which strengthens the Disjoint Amalgamation Property. In Part I, we prove that every Fraisse structure in a finite relational language with relation symbols of any finite arity satisfying this property is indivisible. In Part II, we prove that every Fraisse structure in a finite relational language with relation symbols of arity at most two having this property has finite big Ramsey degrees which have a simple characterization. It follows that any such Fraisse structure admits a big Ramsey structure. Part II utilizes the notion of coding trees of 1-types developed in Part I and a theorem from Part I which functions as a pigeonhole principle for induction arguments in this paper. Our approach yields a direct characterization of the degrees without appeal to the standard method of "envelopes". This work offers a streamlined and unifying approach to Ramsey theory on some seemingly disparate classes of Fraisse structures.

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Rebecca Coulson, Natasha Dobrinen, Rehana Patel. 2022-07-13. Fraisse structures with SDAP+, Part II: Simply characterized big Ramsey structures. https://arxiv.org/abs/2207.06505

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