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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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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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