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Sep 18, 2020 at 16:06 comment added Jeff Normally you would square the $L^2$ norm, differentiate in $t$, and use the PDEs to get an inequality, to which you apply Gronwall. Have you tried this kind of approach? Where do you get stuck?
Sep 15, 2020 at 18:48 history edited Riku CC BY-SA 4.0
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Sep 15, 2020 at 9:33 history asked Riku CC BY-SA 4.0