I need some references (far away from Wikipedia) about the proof using Ultrafilters of Arrow's Impossibility Theorem. Online resources are preferred.
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@Norbert’s first link should be this, and the second is to a PDF that contains a somewhat different result. The paper linked from the comment after this MSE answer contains a proof, but this blog post does it more neatly. This PDF by Joel Robbin is another. – Brian M. Scott Nov 28 '13 at 23:51
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I wrote up a proof here: http://blog.jyotirmoy.net/2013/10/arrows-impossibility-theorem-and.html – Jyotirmoy Bhattacharya Jan 19 '14 at 16:40
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Since no one else has answered, I’m turning my comment into an answer. This blog post gives a reasonably clear version of the proof. This one is a bit better and has a nice follow-on on the Gibbard-Satterthwaite theorem. This PDF by Joel W. Robbin at the University of Wisconsin — Madison also does a nice job.
Brian M. Scott
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