This is not a question, just very, very, very sad news. Our community has lost one of its most active members. I am posting a letter I received recently.
From Carel Faber and Sandra Di Rocco:
November 23, 2011
Dear colleagues from the Algebraic Geometry community,
Unfortunately, we have some very sad news:
Torsten Ekedahl has passed away.
Torsten collapsed this morning at the Stockholm University Mathematics Department and died shortly thereafter. Attempts of colleagues and ambulance personnel to resuscitate him were unfortunately unsuccessful.
The SU Mathematics Department and the mathematical communities in Stockholm and Sweden have suffered a great loss. All who knew Torsten personally or through his work know that he was an exceptional mathematician, in many different ways. Torsten's main interest was Algebraic Geometry, but his research and knowledge went far beyond our field.
Torsten Ekedahl will be sorely missed by many.
Carel Faber and Sandra Di Rocco