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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Dec 29, 2010 at 0:42 history edited Dmitri Pavlov CC BY-SA 2.5
deleted 72 characters in body
Nov 16, 2009 at 16:41 comment added Semyon Dyatlov Even though (1) is a completely legitimate answer and seems to work in both provided cases, (3) is the answer I like more because it does not make any explicit reference to any operators, bounded or not. As for (2), it does not include enough operators; in particular, it does not seem to include any reasonable differential operator.
Nov 16, 2009 at 16:32 history answered Dmitri Pavlov CC BY-SA 2.5