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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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Is this question appropriate for mathoverflow? I personnally believe not: what kind of answer can one expect? – DamienC Mar 14 '13 at 14:26
As it doesn't admit a single correct answer, it should certainly be community-wiki. – HJRW Mar 14 '13 at 14:35
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). – ACL Mar 14 '13 at 15:06
That seems like a strange way to come up with questions... – Adeel Khan Mar 20 '13 at 15:11
Congratulations to Deligne on the Abel Prize, and to o-o'HO2 on predicting it! – Rodrigo A. Pérez Mar 20 '13 at 16:04

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