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Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.

6 votes

The intersection of a circle and a rank 3 subgroup of the plane

Here's at least a method that probably solves the problem. I say "probably" because I'm not entirely confident in my treatment of degenerate cases. Anyway, the main idea is to try to construct a secon …
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