This web presentation contains the audio and slides of a lecture given at the Fields Institute on September 23, 2002 as part of the Workshop on Categorical Structures for Descent and Galois Theory, Hopf Algebras and Semiabelian Categories. RealPlayer 7 or later, or other software capable of playing streaming audio, is required.
Start audio presentation
You may browse the slides in the presentation (a browser capable of displaying PNG graphics is required).
Shown: slide 1. Next Slide