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In page Institut des Hautes Études Scientifiques:

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The strong personality of Alexander Grothendieck and the broad sweep of his revolutionizing theories were a dominating feature of the first ten years at the IHÉS.[3] René Thom received an invitation from IHÉS in 1963 and after his appointment remained there until his death in 2002.[4] Dennis Sullivan is remembered as one who had a special talent for encouraging fruitful exchanges among visitors and provoking a new and deeper insight into their ideas.[citation needed]