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In this biography of Pierre Deligne, there is a quote of Jacques Tits which says that "quite a few of his best ideas have never been written!".

What are some of his best ideas that you have heard of that he hasn't written about?

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    $\begingroup$ Is this question appropriate for mathoverflow? I personnally believe not: what kind of answer can one expect? $\endgroup$
    – DamienC
    Commented Mar 14, 2013 at 14:26
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    $\begingroup$ I wonder how Deligne will feel if he reads that question... $\endgroup$ Commented Mar 14, 2013 at 14:40
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    $\begingroup$ The proof that the Weil conjectures implies the Ramanujan conjecture on coefficients of modular forms only exists as a Bourbaki Seminar. Serre wrote a few times (as a footnote in his Course in Arithmetic, or in his Complete Works) that he regrets this. Around 10 years ago, Brian Conrad had undertaken to write a book on the topic, but I don't think that the book has appeared (yet). $\endgroup$
    – ACL
    Commented Mar 14, 2013 at 15:06
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    $\begingroup$ In trying to predict this year's prize, I searched Wikipedia for Fields medalists over 65 who hadn't yet won the Abel prize. Deligne looked like a good candidate. So then I looked for a question to ask. $\endgroup$
    – user32199
    Commented Mar 20, 2013 at 14:48
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    $\begingroup$ Congratulations to Deligne on the Abel Prize, and to o-o'HO2 on predicting it! $\endgroup$ Commented Mar 20, 2013 at 16:04

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