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Oct 11, 2012 at 15:41 comment added András Bátkai I may miss something, but how does this imply the existence of the family $E(t)$?
Oct 11, 2012 at 15:39 comment added András Bátkai According to the OPs comment to my answer, he wants to have $c_0=0$.
Oct 10, 2012 at 20:05 comment added Delio Mugnolo Yes, this is pretty much what's behind the above mentioned Lions' result.
Oct 10, 2012 at 19:54 history answered Bazin CC BY-SA 3.0