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Aug 9, 2013 at 4:53 vote accept Alexander Pruss
Aug 9, 2013 at 2:16 history edited Alexander Pruss CC BY-SA 3.0
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Aug 8, 2013 at 22:55 answer added Alexander Pruss timeline score: 0
Jul 16, 2013 at 3:09 comment added Alexander Pruss Actually, there is no way the Parikh and Parnes construction could generalize to $\mathbb R^2$, since it requires constructing a finitely additive hyperreal-valued measure that is almost invariant in the sense that $(\mu(\rho A)-\mu(A))/\mu(A)$ is infinitesimal for non-empty $A$ and isometry $\rho$. But such a measure would rule out bounded paradoxical subsets.
Jul 9, 2013 at 2:51 history edited Alexander Pruss CC BY-SA 3.0
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Jul 7, 2013 at 20:15 history asked Alexander Pruss CC BY-SA 3.0