Rapport d'expertise au compte du Bureau Asie Pacifique (BAP) de l'Agence universitaire de la Francophonie

Temporal logic has been successfully used for modeling and analyzing the behavior of reactive and concurrent systems. One shortcoming of (standard) temporal logic is that it is inadequate for real-time applications, because it only deals with qualitative timing properties. This is overcome by metric temporal logics which ooer a uniform logical framework in which both qualitative and quantitativ...

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Although every computable data type has an initial algebra speci-cation with hidden functions, it may happen that some of the homo-morphic images of the data type are not models of the speciication. The latter are reducts of algebras that would be models of the specii-cation if all its functions were visible, whereas the homomorphic images of the data type are independent of the speciication an...

A correctness proof of a variant of Segall's Propagation of Information with Feedback protocol is presented. The proof, which is carried out within the I/O automata model of Lynch and Tuttle, is standard except for the use of a prophecy variable. The aim of this paper is to show that, unlike what has been suggested in the literature, assertional methods based on invariant reasoning support an i...

We survey here various approaches which were proposed to incorporate negation in logic programs. We concentrate on the proof-theoretic and model-theoretic issues and the relationships between them.

1 General Description ACI Rossignol is composed of teams from LIF (UMR 6166), LSV (UMR 8643 CNRS ENS Cachan and INRIA Futurs-project SECSI), INRIA Futurs (project Comète) and Verimag (UMR 9939). The Rossignol project aims at investigating issues involved in the verification of cryptographic protocols. The focus has been put on research directions that go beyond the classical approach devised fo...

The main modes of behavior of a food chain model, composed of logistic prey and Holling type II predator and superpredator, are discussed in this paper. The study is carried out through bifurcation analysis, alternating between a normal form approach and numerical continuation. The two-parameter bifurcation diagram of the model contains Hopf, fold and transcritical bifurcation curves of equilib...