RT Journal Article T1 Hybrid Partial Type Theory A1 Manzano Arjona, María A1 Huertas, Antonia A1 Blackburn, Patrick A1 Martins, Manuel Antonio A1 Aranda Utrero, Víctor AB In this article we define a logical system called Hybrid Partial Type Theory (HPTT ). The system is obtained by combining William Farmer’s partial type theory with a strong form of hybrid logic. William Farmer’s system is a version of Church’s theory of types which allows terms to be non-denoting; hybrid logic is a version of modal logic in which it is possible to name worlds and evaluate expressions with respect to particular worlds. We motivate this combination of ideas in the introduction, and devote the rest of the article to defining, axiomatising, and proving a completeness result for HPTT . PB Cambridge University Press SN 0022-4812 YR 2023 FD 2023 LK https://hdl.handle.net/20.500.14352/98612 UL https://hdl.handle.net/20.500.14352/98612 LA eng NO MANZANO M, HUERTAS A, BLACKBURN P, MARTINS M, ARANDA V. HYBRID PARTIAL TYPE THEORY. The Journal of Symbolic Logic. Published online 2023:1-43. doi:10.1017/jsl.2023.33 NO Ministerio de Economía y Competitividad (España) NO Portuguese funding agency DS Docta Complutense RD 5 abr 2025