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I wonder if anyone has a copy of Deligne's letter to Looijenga from 1974 mentioned as reference [26] in Bessis' paper Finite complex reflection arrangements are $K(\pi,1)$ from 2006, see, and is willing to share it / make it publicly available.

We were recently proving some results generalizing particular aspects of things that are supposed to be proven in there, and we were asked about the historical background. Unfortunately, we cannot really provide an answer since we don't have access to the letter...

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Why not asking Deligne, Looijenga or Bessis? – Johannes Ebert Dec 10 '12 at 21:35
I did ask Bessis, but this wasn't successful - and I wanted to see of this letter is somewhere available before contacting Deligne or Looijenga. – Christian Stump Dec 11 '12 at 8:59
I got a message from Eduard Looijenga saying that he believes this letter to still exist and to possibly make it publicly available. I'll post an update here if possible. – Christian Stump Dec 11 '12 at 17:27
up vote 7 down vote accepted

Eduard Looijenga provided a scanned version of the letter, which now can be found at

Many thanks for making it publicly available!

I also added a section on Deligne's hand-written letters to his wikipedia page, though I am not quite sure this is the right place to collect his publicly available letters.

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