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Jun 24, 2014 at 14:41 comment added limanac @fedja, I have corrected the formula. Please feel free to edit it if necessary.
Jun 24, 2014 at 14:40 history edited limanac CC BY-SA 3.0
added 190 characters in body
Jun 23, 2014 at 17:19 comment added fedja Erm... Looks like in the representation $a$ should be $a^{-1}$, the absolute value on $t$ should be absent, etc. (just compute the value and the derivative at $x=y$), but it doesn't really change anything.
Jun 23, 2014 at 7:54 history asked limanac CC BY-SA 3.0