English

Strongly Minimal Sets and Categoricity in Continuous Logic

Logic 2022-08-12 v2

Abstract

The classical Baldwin-Lachlan characterization of uncountably categorical theories is known to fail in continuous logic in that not every inseparably categorical theory has a strongly minimal set. Here we investigate these issues by developing the theory of strongly minimal sets in continuous logic and by examining inseparably categorical expansions of Banach space. To this end we introduce and characterize 'dictionaric theories,' theories in which definable sets are prevalent enough that many constructions familiar in discrete logic can be carried out. We also introduce, in the context of Banach theories, the notion of an 'indiscernible subspace,' which we use to improve a result of Shelah and Usvyatsov. Both of these notions are applicable to continuous logic outside of the context of inseparably categorical theories. Finally, we construct or present a slew of counterexamples, including an ω\omega-stable theory with no Vaughtian pairs which fails to be inseparably categorical and an inseparably categorical theory with strongly minimal sets in its home sort only over models of sufficiently high dimension.

Keywords

Cite

@article{arxiv.2011.00610,
  title  = {Strongly Minimal Sets and Categoricity in Continuous Logic},
  author = {James Hanson},
  journal= {arXiv preprint arXiv:2011.00610},
  year   = {2022}
}

Comments

92 pages; this preprint subsumes (in Section 6) our earlier preprint arXiv:2004.03062; some errors have been corrected in both

R2 v1 2026-06-23T19:49:31.184Z