# 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

### Approximate Satisfiability and Equivalence

- Date
- Tuesday, March 11 2008 at 11:00AM
- Place
- Salle de Conférence (Pavillon des Jardins)
- Speaker
- Michel de Rougemont (LRI)

We show how to approximate decision problems such as satisfiability of a
formula by a structure, or Equivalence between two formulas, such that we
gain an exponential factor (or more) in complexity.
A typical case is to decide if two Non-deterministic automata are
equivalent: we decide the approximate version in polynomial time whereas the
exact version is PSPACE complete. For Pushdown automata, we decide the
approximate version in exponential time whereas the exact version is
undecidable.