This web presentation contains the audio and slides of a lecture given at the Fields Institute on April 10, 2008 as part of the Clay-Fields Conference on Additive Combinatorics, Number Theory, and Harmonic Analysis.
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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