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Jul 21, 2013 at 18:43 comment added alvarezpaiva I heard it from Marcel Berger in 1994 or 1995 when he was lecturing in Stony Brook. I'm pretty sure I saw the problem (also for rank one symmetric spaces) in one of his books.
Jul 21, 2013 at 18:31 history edited Benoît Kloeckner CC BY-SA 3.0
Added the reference to Gromov.
Sep 21, 2012 at 20:45 history answered Benoît Kloeckner CC BY-SA 3.0