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Jul 1, 2015 at 20:12 review Close votes
Jul 5, 2015 at 21:43
Apr 30, 2015 at 19:58 answer added Renato Sanhueza timeline score: 1
Apr 30, 2015 at 18:32 comment added Rick Decker $x$ could be empty, so in your step (2), $y$ could be of the form $ab^n$. You have to show that this possibility also leads to a contradiction. Fortunately, this isn't hard.
Apr 30, 2015 at 15:41 review First posts
May 1, 2015 at 10:28
Apr 30, 2015 at 15:36 history asked user31209 CC BY-SA 3.0