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Feb 4, 2019 at 10:54 vote accept Romeo
Dec 25, 2017 at 17:13 comment added Romeo Or maybe one could work with the sets $E_\alpha = \{x: \lim_{r \to 0} r^{-\alpha}|Du|(B^r(x)) > 0\}$... does this make sense? Thanks.
Dec 25, 2017 at 17:06 comment added Romeo Oh you are right, that is true. So it is interesting to see whether this decomposition into $\alpha$-dimensional sets can be performed... the only thing that comes to my mind is coarea formula, but that does not seem to help... Thanks again.
Dec 25, 2017 at 16:57 comment added Jean Duchon A sum of two "devil's staircases" whose derivatives are carried on Cantor-like sets of different dimensions...
Dec 25, 2017 at 16:53 comment added Romeo Thanks for your interest. Any ideas on references? And btw you say "certainly not with a single $\alpha$": can I ask you if you have a counterexample to disprove my claim?
Dec 25, 2017 at 16:49 history answered Jean Duchon CC BY-SA 3.0