More than 0s and 1s: metric quantifiers and counting over timed words
We study the expressiveness of the pointwise interpretations (i.e. over timed words) of some predicate and temporal logics with metric and counting features. We show that counting in the unit interval (0, 1) is strictly weaker than counting in (0, b) with arbitrary b ≥ 0; moreover, allowing the latter indeed leads to expressive completeness for the metric predicate logic Q2MLO, recovering the corresponding result for the continuous interpretations (i.e. over signals). Exploiting this connection, we show that in contrast to the continuous case, adding "punctual" predicates into Q2MLO is still insufficient for the full expressive power of the Monadic First-Order Logic of Order and Metric (FO[<,+1]). Finally, we propose a generalisation of the recently proposed Pnueli automata modalities and show that the resulting metric temporal logic is expressively complete for FO[<,+1].
History
Publication status
- Published
File Version
- Published version
Journal
30th International Symposium on Temporal Representation and Reasoning (TIME 2023)ISSN
1868-8969Publisher
Leibniz AssociationPublisher URL
External DOI
Volume
278Article number
7Event name
30th International Symposium on Temporal Representation and ReasoningEvent location
Athens, GreeceEvent type
conferenceEvent date
25 - 26 September 2023Series
Leibniz International Proceedings in Informatics (LIPIcs)Department affiliated with
- Informatics Publications
Institution
University of SussexFull text available
- Yes
Peer reviewed?
- Yes