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A MODULAR BISIMULATION CHARACTERISATION FOR FRAGMENTS OF HYBRID LOGIC

Published online by Cambridge University Press:  03 March 2025

GUILLERMO BADIA*
Affiliation:
SCHOOL OF HISTORICAL AND PHILOSOPHICAL INQUIRY UNIVERSITY OF QUEENSLAND BRISBANE, QLD, AUSTRALIA
DANIEL GĂINĂ
Affiliation:
INSTITUTE OF MATHEMATICS FOR INDUSTRY KYUSHU UNIVERSITY FUKUOKA, JAPAN E-mail: daniel@imi.kyushu-u.ac.jp
ALEXANDER KNAPP
Affiliation:
INSTITUTE OF COMPUTER SCIENCE UNIVERSITY OF AUGSBURG AUGSBURG, GERMANY E-mail: knapp@informatik.uni-augsburg.de
TOMASZ KOWALSKI
Affiliation:
DEPARTMENT OF LOGIC, INSTITUTE OF PHILOSOPHY JAGIELLONIAN UNIVERSITY KRAKÓW, POLAND SCHOOL OF MATHEMATICAL AND PHYSICAL SCIENCES LA TROBE UNIVERSITY, MELBOURNE VIC, AUSTRALIA and SCHOOL OF HISTORICAL AND PHILOSOPHICAL INQUIRY UNIVERSITY OF QUEENSLAND BRISBANE, QLD, AUSTRALIA E-mail: tomasz.s.kowalski@uj.edu.pl
MARTIN WIRSING
Affiliation:
DEPARTMENT OF COMPUTER SCIENCE LUDWIG-MAXIMILIANS-UNIVERSITY MUNICH MUNICH, GERMANY E-mail: wirsing@lmu.de

Abstract

There are known characterisations of several fragments of hybrid logic by means of invariance under bisimulations of some kind. The fragments include $\{\mathord {\downarrow }, \mathord {@}\}$ with or without nominals (Areces, Blackburn, Marx), $\mathord {@}$ with or without nominals (ten Cate), and $\mathord {\downarrow }$ without nominals (Hodkinson, Tahiri). Some pairs of these characterisations, however, are incompatible with one another. For other fragments of hybrid logic no such characterisations were known so far. We prove a generic bisimulation characterisation theorem for all standard fragments of hybrid logic, in particular for the case with $\mathord {\downarrow }$ and nominals, left open by Hodkinson and Tahiri. Our characterisation is built on a common base and for each feature extension adds a specific condition, so it is modular in an engineering sense.

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© The Author(s), 2025. Published by Cambridge University Press on behalf of The Association for Symbolic Logic

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