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Dec 15, 2018 at 15:37 comment added Iskander Kalimullin Thanks for the comment, I just made $s$ strictly increasing in the answer.
Dec 15, 2018 at 15:36 history edited Iskander Kalimullin CC BY-SA 4.0
added 28 characters in body
Dec 15, 2018 at 15:35 vote accept Salvo
Dec 15, 2018 at 15:33 comment added Salvo Ok, nice answer!
Dec 15, 2018 at 15:20 comment added Iskander Kalimullin Ok, $s$ must be chosen injective by s-m-n theorem and padding lemma. Then $n=s^{-1}(x)$.
Dec 15, 2018 at 14:02 comment added Salvo What's the "$n$" in the definition of $\psi$?
Dec 14, 2018 at 23:23 history answered Iskander Kalimullin CC BY-SA 4.0