Complexity of matching problems
Proc. of the first international conference on Rewriting techniques and applications
Handbook of theoretical computer science (vol. B)
An essay in combinatory dynamic logic
Information and Computation
Modal logic
Axiomatising the Logic of Computer Programming
Axiomatising the Logic of Computer Programming
First-Order Dynamic Logic
Dynamic Logic
Recurring Dominoes: Making the Highly Undecidable Highly Understandable (Preliminary Report)
Proceedings of the 1983 International FCT-Conference on Fundamentals of Computation Theory
Propositional Dynamic Logics of Programs: a Survey
Logic of Programs, Workshop
Iteration-free PDL with Intersection: a Complete Axiomatization
Fundamenta Informaticae
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We devote this paper to the completeness of an axiom system for PDL0∩ -- a variant of PDL which includes the program operations of composition and intersection. Most of the difficulty in the proof of the completeness theorem for PDL0∩ lies in the fact that intersection of accessibility relations is not modally definable. We overcome this difficulty by considering the concepts of theory and large program. Theories are sets of formulas that contain PDL0∩ and are closed under the inference rule of modus ponens. Large programs are built up from program variables and theories by means of the operations of composition and intersection, just as programs are built up from program variables and tests. Adapting these concepts to the subordination method, we can prove the completeness of our deductive system for PDL0∩.