This is a talk by Dror Atariah of Freie Universität Berlin / Berlin Mathematical School, given at the "What is ...?" seminar at the Freie... » More

This is a talk by Dror Atariah of Freie Universität Berlin / Berlin Mathematical School, given at the "What is ...?" seminar at the Freie Universität Berlin on November 21, 2008, https://www.math.fu-berlin.de/w/Math/WhatIsSeminar .

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