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Feb 12, 2013 at 0:31 comment added whuber +1 I see you have been acquainted with our site for a long time, but I would like nevertheless to welcome you on the occasion of posting your first answers. This is a nice clear explanation that gets to the heart of the matter.
Feb 11, 2013 at 22:23 review First posts
Feb 11, 2013 at 22:31
Feb 11, 2013 at 22:07 history answered Doctorambient CC BY-SA 3.0