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Sep 26, 2013 at 13:15 comment added username If it was just a norm of $f$, how would the positivity of $f$ show up?
May 16, 2012 at 15:22 vote accept CommunityBot
May 16, 2012 at 15:22 history bounty ended timur
May 9, 2012 at 17:02 history edited Michael Renardy CC BY-SA 3.0
added 387 characters in body
May 9, 2012 at 15:01 history answered Michael Renardy CC BY-SA 3.0