PERIPATETIC SEMINAR ON SHEAVES AND LOGIC 90th meeting - first announcement Dear Colleagues, As announced officially at PSSL89 in Louvain-la-Neuve, the 90th meeting of the seminar will be held at the Department of Theoretical Computer Science of the Technical University Braunschweig, Germany, during April 24-25, 2010. As always, the seminar welcomes talks that use category theory or logic, either explicitly or implicitly, in the study of any aspect of mathematics or science. Braunschweig is located about 60 km East of Hannover and about 200 km West of Berlin. It can easily be reached by car or train. The closest airport is in Hannover; trains to Hannover's main railway station take about 17 minutes, and trains from there to Braunschweig take about 40 minutes or less. An online registration form can be found at http://www.iti.cs.tu-bs.de/TI-INFO/koslowj/PSSL90.html Further information on the location of the seminar, along with details on local travel, accommodation etc. will become avilable there by mid-January. Best regards, Jiri Adamek Jürgen Koslowski Stefan Milius [For admin and other information see: http://www.mta.ca/~cat-dist/ ]