English

IKT$^\omega$ and \L{}ukasiewicz-models

Logic 2021-04-30 v2

Abstract

In this note, we show that the first-order logic IKω^\omega is sound with regard to the models obtained from continuum-valued \L{}ukasiewicz-models for first-order languages by treating the quantifiers as infinitary strong disjunction/conjunction rather than infinitary weak disjunction/conjunction. Moreover, we show that these models cannot be used to provide a new consistency proof for the theory of truth IKTω^\omega obtained by expanding IKω^\omega with transparent truth because the models are inconsistent with transparent truth. Finally, we show that whether or not this inconsistency can be reproduced in the sequent calculus for IKTω^\omega depends on how vacuous quantification is treated.

Cite

@article{arxiv.2011.06991,
  title  = {IKT$^\omega$ and \L{}ukasiewicz-models},
  author = {Andreas Fjellstad and Jan-Fredrik Olsen},
  journal= {arXiv preprint arXiv:2011.06991},
  year   = {2021}
}

Comments

9 pages, to appear in the Notre Dame Journal of Formal Logic

R2 v1 2026-06-23T20:11:09.266Z