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Thursday, June 8, 2017

Advanced Knowledge Problem of the Week: 6-8-17 [Abstract Algebra]

Check out this #AKPotW, and be sure to let us know what you think in the comments below or on social media!

Solution below the break.


1 comment:

  1. Here's a one-line proof (from "Baby Rudin", I think):

    -(-a) = 0 + -(-a) = (a + -a) + -(-a) = a + (-a + -(-a)) = a + 0 = a