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Mar 1, 2018 at 19:52 comment added Challenger5 "the halting problem looks like it should be really, really easy" I don't find this true at all. When I first heard about it my thought process was "hmm... you could approach that by... wait, no, that wouldn't work... huh, that's really hard."
Jan 6, 2014 at 8:31 comment added Thomas Ahle "polygon which has infinity perimeter and zero area", like a very long and slim rectangle?
Jan 5, 2014 at 23:51 comment added superAnnoyingUser Rice's theorem does sound completely ludicrous.
May 8, 2012 at 4:07 history made wiki Post Made Community Wiki by J. M. ain't a mathematician
May 5, 2012 at 17:49 history edited Pete L. Clark CC BY-SA 3.0
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May 2, 2012 at 8:53 history answered MathematicalOrchid CC BY-SA 3.0