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SUMMARY:Selection of characters via empirical processes - Olivier Guedon\,
  Jessieu
DTSTART:20080129T160000Z
DTEND:20080129T170000Z
UID:TALK9059@talks.cam.ac.uk
CONTACT:Ben Green
DESCRIPTION:Let f_1\,...\,f_n be a bounded orthonormal system\, and let  k
  be less than n. I will discuss the problem in\nfinding a subset I of card
 inality greater than n-k such that on the span of the f_i\, i in I\,\nthe 
 L_1 norm and the  L_2 norm are\n"comparable". Instead of the classical met
 hod of selectors\, we use empirical\nprocesses. I will describe some resul
 ts about the supremum of an empirical\nprocess (proved via the use of majo
 rizing measures).\n
LOCATION:MR13\, CMS
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