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.

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- Date
- Tuesday, December 18 2007 at 11:00AM
- Place
- Salle de Conférence (Pavillon des Jardins)
- Speaker
- Laurent Doyen (EPFL, Suisse)

We consider the equivalence problem for probabilistic machines. Two
probabilistic machines are equivalent if every finite sequence of
observations has the same probability of occurrence in the two machines.
We show that deciding equivalence is polynomial for labeled Markov chains,
using a reduction to the equivalence problem for probabilistic automata,
which is known to be polynomial. We provide an alternative algorithm to
solve the latter problem, which is based on a new definition of
bisimulation for probabilistic machines.

Then, we consider the equivalence problem for labeled Markov decision
processes (LMDPs) which asks given two LMDPs whether for every way of
resolving the decisions in each of the processes, there exists a way of
resolving the decisions in the other process such that the resulting
probabilistic machines are equivalent. The decidability of this problem
remains open. We show that the strategies used to resolve the decisions
can be restricted to be observation-based, but may require infinite
memory.

This is a joint work with Tom Henzinger and Jean-Francois Raskin.

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