A classification of 2-chains having 1-shell boundaries in rosy theories

Byunghan Kim, Sunyoung Kim, Junguk Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We classify, in a nontrivial amenable collection of functors, all 2-chains up to the relation of having the same 1-shell boundary. In particular, we prove that in a rosy theory, every 1-shell of a Lascar strong type is the boundary of some 2-chain, hence making the 1st homology group trivial. We also show that, unlike in simple theories, in rosy theories there is no upper bound on the minimal lengths of 2-chains whose boundary is a 1-shell.

Original languageEnglish
Pages (from-to)322-340
Number of pages19
JournalJournal of Symbolic Logic
Issue number1
Publication statusPublished - 2015 Mar 13

Bibliographical note

Publisher Copyright:
© 2015, Association for Symbolic Logic.

All Science Journal Classification (ASJC) codes

  • Philosophy
  • Logic


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