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Mar 9, 2012 at 20:46 history edited David E Speyer CC BY-SA 3.0
added 479 characters in body
Mar 9, 2012 at 20:41 comment added David E Speyer Sorry, that was a little obnoxious of me. It is a nice question, which I've been thinking about for the last hour without success.
Mar 9, 2012 at 18:39 comment added Anixx Thanks but what if we limit ourselves to only real-valued functions?
Mar 9, 2012 at 18:36 history answered David E Speyer CC BY-SA 3.0