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Timeline for Controling mixed derivatives

Current License: CC BY-SA 3.0

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Apr 13, 2017 at 12:19 history edited CommunityBot
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Sep 11, 2014 at 11:37 vote accept AlexR
Aug 22, 2014 at 8:28 answer added Willie Wong timeline score: 1
Aug 22, 2014 at 7:56 history edited AlexR CC BY-SA 3.0
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Aug 22, 2014 at 7:21 history edited AlexR CC BY-SA 3.0
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Aug 22, 2014 at 7:21 comment added AlexR @JoonasIlmavirta Actually, I forgot to mention that $\chi(\mathbb R) = \psi(\mathbb R) = [0,1]$. Editing that in. Again, thanks for looking at the problem :)
Aug 21, 2014 at 16:29 comment added Joonas Ilmavirta For $N=0$ and $z\in\mathbb R$ your statement reads $\int_0^1t^z|1-\psi(t\tau)||\chi(t)|dt\leq C_0\int_0^1t^z|\chi(t)|dt$. You can make $\psi|_{[4/3,5/3]}$ arbitrarily large and choose $\tau$ large to violate this for any $C_0$. Are there perhaps more assumptions (or errors in what I wrote)?
Aug 21, 2014 at 16:14 history edited AlexR CC BY-SA 3.0
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Aug 21, 2014 at 16:13 comment added AlexR @JoonasIlmavirta Actually not, thanks for noticing :)
Aug 21, 2014 at 14:45 comment added Joonas Ilmavirta Are you sure your parentheses are as they should? The LHS has $t^z(1-\psi\chi)$ but the RHS suggests that you might want $t^z(1-\psi)\chi$.
Aug 21, 2014 at 14:05 review First posts
Aug 21, 2014 at 14:08
Aug 21, 2014 at 14:04 history asked AlexR CC BY-SA 3.0