LSV Seminar

The LSV seminar takes place on Tuesday at 11:00 AM. The usual location is the conference room at Pavillon des Jardins (venue). If you wish to be informed by e-mail about upcoming seminars, please contact Stéphane Le Roux and Matthias Fuegger.

The seminar is open to public and does not require any form of registration.

Past Seminars

Weak Time Petri Nets Strike Back!

 Arnaud Sangnier
Tuesday, May 19 2009 at 11:00AM
Salle de Conférence (Pavillon des Jardins)
Arnaud Sangnier (Dipartimento di Informatica, Università degli studi di Torino, Italy)

We consider the model of Time Petri Nets where time is associated with transitions. Two semantics for time elapsing can be considered: the strong one, for which all transitions are urgent, and the weak one, for which time can elapse arbitrarily. It is well known that many verification problems such as the marking reachability are undecidable with the strong semantics. In this talk, we focus on Time Petri Nets with weak semantics equipped with three different memory policies for the firing of transitions. We prove that the reachability problem is decidable for the most common memory policy (intermediate) and becomes undecidable otherwise. Moreover, we study the relative expressiveness of these memory policies and obtain partial and surprising results.

This a joint work with Pierre-Alain Reynier (LIF-Université Aix-Marseille)

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