This web presentation contains the audio and slides of a lecture given at the Fields Institute on August 9, 2002 as part of the Workshop on Geometry, Dynamics and Mechanics in Honour of the 60th Birthday of J.E. Marsden.
Listen to audio presentation:
Ogg Vorbis format (downloadable too; right-click to download)
MP3 format (downloadable too; right-click to download)
You may browse the slides in the presentation (a browser capable of displaying PNG graphics is required).
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