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Nov 21, 2011 at 3:05 comment added Benoit Jubin As defined, $\psi$ is a finite sum locally at non-integers. Don't you want to make $\phi$ 1-periodic (and as defined on [0,1])? Or else, write $\phi(2^k x - [2^k x])$?
Oct 25, 2010 at 18:16 vote accept zamanjan
Oct 25, 2010 at 11:22 history edited Andrey Rekalo CC BY-SA 2.5
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Oct 25, 2010 at 3:56 history edited Andrey Rekalo CC BY-SA 2.5
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Oct 25, 2010 at 3:39 history answered Andrey Rekalo CC BY-SA 2.5