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Apr 5, 2015 at 20:29 comment added Igor Belegradek I have no idea. Since none of the alternatives works, it puzzles me why you even posted this.
Apr 5, 2015 at 19:33 comment added Anton Petrunin @IgorBelegradek, I think you know what I mean, do not you?
Apr 5, 2015 at 12:33 comment added Igor Belegradek Still does not work. You cannot really mean $C^k\setminus C^{k-1}$ because this is the empty set. If you mean $C^k\setminus C^{k+1}$, then it is unclear how $S$ is defined on $C^{k+1}$. If you mean to use the formula separately for each $k$, then it is unclear why $S$ is continuous.
Apr 5, 2015 at 3:03 comment added Anton Petrunin @IgorBelegradek corrected.
Apr 5, 2015 at 3:02 history edited Anton Petrunin CC BY-SA 3.0
added 89 characters in body
Apr 5, 2015 at 1:21 comment added Igor Belegradek This does not work. I need the operator for each $k$ while in your constriction $k$ varies. If we fix $k$, and let $S(f)=\sigma(f)(1+h_i)$ with $h_i\in C^{k+1}-C^k$ and $h_i\to 0$ as $i\to\infty$, then the operator does not have property (2).
Apr 4, 2015 at 19:45 history answered Anton Petrunin CC BY-SA 3.0