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

Fragments of first-order logic over infinite words

 Volker Diekert
Tuesday, September 29 2009 at 11:00AM
Salle de Conférence (Pavillon des Jardins)
Volker Diekert (University of Stuttgart, Germany)

In my lecture I report about a joint work with Manfred Kufleitner which was presented at STACS 09 in Freiburg. In that work we give topological and algebraic characterizations as well as language theoretic descriptions of the following subclasses of first-order logic for omega-languages: Sigma2, FO2, the intersection of FO2 and Sigma2, and Delta2 (and by duality Pi2 and the intersection of FO2 and Pi2). These descriptions extend the respective results for finite words. In particular, we relate the above fragments to language classes of certain (unambiguous) polynomials. The talk is interplay of algebraic, topological, and language theoretic properties.

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