By Helmut Seidl

This ebook constitutes the refereed lawsuits of the tenth overseas convention on Foundations of software program technology and Computation constructions, FOSSACS 2007, held in Braga, Portugal in March/April 2007 as a part of ETAPS 2007, the eu Joint meetings on idea and perform of Software.

The 25 revised complete papers awarded including the summary of one invited speak have been conscientiously reviewed and chosen from 103 submissions. The papers conceal a large spectrum on theories and techniques to help research, synthesis, transformation and verification of courses and software program structures. particularly the next themes are handled: algebraic types, automata and language concept, behavioral equivalences, express versions, computation tactics over discrete and non-stop information, endless kingdom platforms computation constructions, logics of courses, modal, spatial, and temporal logics, versions of concurrent, reactive, disbursed, and cellular structures, strategy algebras and calculi, semantics of programming languages, software program specification and refinement, sort structures and sort thought, basics of safety, semi-structured info, software correctness and verification.

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Additional resources for Foundations of Software Science and Computational Structures: 10th International Conference, FOSSACS 2007, Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2007, Braga, Portugal, March 24-April 1, 2007. Proceedings

Example text

For instance, is undefined on the unbound history expression H new(n) ¡ new(n) ¡ «(n), because it is unclear whether the action « is performed on the resource n created first or the second new). g. e Ò Û x Ò Ò Û y Ò «(y), because new(r)new(r¼ )«(r¼ ) is not represented by H. g. new(n) ¡ ( h · new(n¼ ) ¡ «(n) ¡ «(n¼ ) ¡ h) ¡ «(n) is bindified into ( n new(n) ¡ ( h · ( n¼ new(n¼ ) ¡ «(n) ¡ «(n¼ ) ¡ h)) ¡ «(n)). Instead, is not defined on ( h · new(n) ¡ h) ¡ «(n), because the name n accessed through « could be any name generated by the new inside the loop.

We define below a type and e«ect system for [ ] . E«ects H are unbound history expressions. Types comprise the unit 1, sets R (Res Nam) ¢ 2Act , H and arrows . For instance, a resource r with capabilities ­ has the singleton type (r ­) (we omit the capabilities when irrelevant). Type environments have the form ¡; : where ¾ Var Res is not already in dom(¡). A typing judgment ¡ e : H means that, in a type environment ¡, the expression e evaluates to a value of type , and H produces a history belonging to the e«ect H.

22. R. Milner. A theory of type polymorphism in programming. Journal of Computer and System Sciences, 17(3):348–375, 1978. 23. G. Pottinger. A type assignment for strongly normalizable λ-terms. B. Curry, Essays in Combinatory Logic, Lambda-Calculus and Formalism, pages 535– 560. Academic Press, 1980. 24. J. A. Robinson. A machine-oriented logic based on the resolution principle. Journal of the ACM, 12(1):23–41, 1965. 25. Y. Toyama. Confluent term rewriting systems with membership. In Proceedings of the 1st International Workshop on Conditional Term Rewriting Systems, CTRS’87, Orsay, France, volume 308 of LNCS, pages 228–241.

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