Decidability and expressive power of real time logics

Alexander Rabinovich*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Temporal Logic based on the two modalities "Since" and "Until" (TL) is popular among computer scientists as the framework for reasoning about a system evolving in time. This logic is usually referred to as the standard linear time temporal logic. The "linear time" appears in the name of this logic probably because when it was introduced by Pnueli its intended models were linear orders; more precisely, ω-models. The adjective "standard" is presumable used due to the Kamp theorem which states that it is expressively equivalent (over the w-models) to first order monadic logic of order - a very fundamental logic. The two logics are expressively equivalent whether the system evolves in discrete steps or in continuous time; however, for continuous time, both logics can not express properties like: "X will happen exactly after one unit of time." Unfortunately, the extension of TL by this modality is undecidable. Two of the most important characteristics of specification formalisms are expressive power and the decidability/complexity of the validity and model checking problems. Over the years, different extensions of TL which can specify metric properties of real time were suggested. The goal of this talk is to survey expressiveness and decidability results for temporal and predicate logics for the specification of metric properties of real time.

Original languageEnglish
Title of host publicationFormal Modeling and Analysis of Timed Systems - 4th International Conference, FORMATS 2006, Proceedings
PublisherSpringer Verlag
Number of pages1
ISBN (Print)3540450262, 9783540450269
StatePublished - 2006
Event4th International Conference on Formal Modeling and Analysis of Timed Systems, FORMATS 2006 - Paris, France
Duration: 25 Sep 200627 Sep 2006

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume4202 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference4th International Conference on Formal Modeling and Analysis of Timed Systems, FORMATS 2006


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