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Nov 2, 2009 at 8:39 vote accept Sevak Mkrtchyan
Nov 2, 2009 at 8:27 history edited Sevak Mkrtchyan CC BY-SA 2.5
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Nov 2, 2009 at 8:20 comment added Sevak Mkrtchyan I rephrased the question, so hopefully its more clear.
Nov 2, 2009 at 8:18 history edited Sevak Mkrtchyan CC BY-SA 2.5
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Nov 2, 2009 at 8:03 answer added Darsh Ranjan timeline score: 5
Nov 2, 2009 at 7:45 comment added Yemon Choi My first guess is that you might need something slightly stronger than being differentiable (perhaps bounded variation in some neighbourhood of 0).
Nov 2, 2009 at 3:43 history asked Sevak Mkrtchyan CC BY-SA 2.5