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Aug 14, 2015 at 22:22 history edited Will Sawin CC BY-SA 3.0
added 2261 characters in body
Aug 12, 2015 at 20:13 comment added Joël Thank Will. That answers the question as asked (initially). Unfortunately, the question I asked is not exactly the one I wanted to ask, which was "modulo the center". I tried to simplify it at the last minute when asking it and messed it up. I will change the question accordingly.
Aug 12, 2015 at 19:49 history answered Will Sawin CC BY-SA 3.0