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when toggle format what by license comment
Dec 23, 2009 at 6:23 comment added Reid Barton Both authors are defining exactly the same thing, just with slight differences of notation.
Dec 23, 2009 at 6:19 answer added Mariano Suárez-Álvarez timeline score: 7
Dec 23, 2009 at 5:59 history asked Dan CC BY-SA 2.5