The Henson graph is an important concept in the field of graph theory, particularly in the study of countable structures and model theory. It is named after the mathematician John Henson who introduced it in the context of descriptive set theory and the study of universal structures. The Henson graph can be defined as follows: - It is a **countable graph** that is **triangle-free**, meaning that it does not contain any triangles (three vertices that are all mutually connected).
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