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There are finitely many graphs with diameter 2 and girth 5. What if the girth 5 assumption is relaxed? Apart from stars, are there finitely many triangle-free graphs with diameter 2 and no K₂, ₃ subgraph? This question is related to the existence of triangle-free strongly regular graphs, but allowing for a range of co-degrees gives the question a more extremal flavour. More generally, for fixed s and t, are there infinitely many twin-free triangle-free Kₒ, ₓ-free graphs with diameter 2? This paper presents partial results regarding these questions, including computational results, potential Cayley-graph and probabilistic constructions.
Devillers et al. (Fri,) studied this question.