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  • 26

    Days Read in a Row 2011-01-15

  • The Tagger 2010-05-19

  • Posted a Comment 2009-02-20

  • 2

    Member of the 4 Digit UID Club 2009-03-27

  • Had a Comment Modded Up 2012-04-17

What are these achievement things?

We warn the reader in advance that the proof presented here depends on a clever but highly unmotivated trick. -- Howard Anton, "Elementary Linear Algebra"