Summary: The Benefits of Relaxing Punctuality 1
Rajeev Alur
AT&T Bell Laboratories
Murray Hill, NJ 07974
Email: alur@research.att.com
Tom'as Feder
IBM Almaden Research Center
San Jose, CA 95120
Email: tomas@almaden.ibm.com
Thomas A. Henzinger 2
Computer Science Department, Cornell University
Ithaca, NY 14853
Email: tah@cs.cornell.edu
Abstract. The most natural, compositional, way of modeling real­time systems uses
a dense domain for time. The satisfiability of timing constraints that are capable of
expressing punctuality in this model, however, is known to be undecidable. We introduce
a temporal language that can constrain the time difference between events only with
finite, yet arbitrary, precision and show the resulting logic to be EXPSPACE­complete.
This result allows us to develop an algorithm for the verification of timing properties of
real­time systems with a dense semantics.

Source: Alur, Rajeev - Department of Computer and Information Science, University of Pennsylvania
Henzinger, Thomas A. - Faculté Informatique et Communications, Ecole Polytechnique Fédérale de Lausanne

Collections: Computer Technologies and Information Sciences