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Classification properties for some ternary structures

Alberto Miguel-Gómez

Vol. 4 (2025), No. 3, 203–230
Abstract

We provide a model-theoretic classification of the countable homogeneous H4-free 3-hypertournament studied by Cherlin, Hubička, Konečný, and Nešetřil. Our main result is that the theory of this structure is  SOP3,  TP2, and  NSOP4. We offer two proofs of this fact: one is a direct proof, and the other employs part of the abstract machinery recently developed by Mutchnik.

Keywords
$\mathrm{NSOP}_{4}$, homogeneous hypertournaments, Conant-independence
Mathematical Subject Classification
Primary: 03C45
Milestones
Received: 17 May 2024
Revised: 30 July 2025
Accepted: 9 August 2025
Published: 5 November 2025
Authors
Alberto Miguel-Gómez
Department of Mathematics
Imperial College London
London
United Kingdom