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Feb 10, 2023 at 7:34 comment added Dejv user378654- I edited the question!
Feb 10, 2023 at 7:33 history edited Dejv CC BY-SA 4.0
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Feb 10, 2023 at 5:30 comment added user378654 While "two times differentiable almost everywhere" is somewhat ambiguous, the statement is trivially false as written regardless of interpretation (take e.g. $u$ a primitive of a Cantor function in 1D, $f = 0$). Perhaps you meant to put some further assumption on $u$?
Feb 9, 2023 at 21:30 history edited Dejv CC BY-SA 4.0
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Feb 9, 2023 at 21:21 history edited Daniele Tampieri CC BY-SA 4.0
Minor Math Jaxing
Feb 9, 2023 at 21:12 history edited Dejv CC BY-SA 4.0
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Feb 9, 2023 at 20:35 history asked Dejv CC BY-SA 4.0