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when toggle format what by license comment
Mar 14, 2017 at 21:54 history edited GH from MO CC BY-SA 3.0
I changed $a$ to $s$ in the last sentence, to be in harmony with earlier notation.
Mar 14, 2017 at 19:07 history edited Joe Silverman CC BY-SA 3.0
Improved formatting, simplified final formula
Mar 14, 2017 at 18:33 history answered Fedor Petrov CC BY-SA 3.0