Geodesic
A survey on big Ramsey structures
Zbornik radova, Tome 22 (2025) no. 30, p. 317

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DOI

In recent years, there has been much progress in the field of structural Ramsey theory, in particular in the study of big Ramsey degrees. In all known examples of infinite structures with finite big Ramsey degrees, there is in fact a single expansion of the structure, called a big Ramsey structure, which correctly encodes the exact big Ramsey degrees of every finite substructure simultaneously. The first half of the article collects facts about this phenomenon that have appeared in the literature into a single cohesive framework, thus offering a conceptual survey of big Ramsey structures. We present some original results indicating that the standard methods of proving finite big Ramsey degrees automatically yield big Ramsey structures, often with desirable extra properties. The second half of the article is a survey in the more traditional sense, discussing numerous examples from the literature and showing how they fit into our framework. We also present some general results on how big Ramsey degrees are affected by expanding structures with unary functions.
DOI : 10.64191/zr24040410109
Classification : 05-02, 05D10, 03E02
Keywords: big Ramsey degrees, big Ramsey structures 
Jan Hubička; Andy Zucker. A survey on big Ramsey structures. Zbornik radova, Tome 22 (2025) no. 30, p. 317 . doi: 10.64191/zr24040410109
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