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

3 votes

Integer-distance sets

RE: Daniel's and Carl's comments above, the "famous unsolved problem" is problem D20 from Guy, R. K. Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, p. 187, 1994. The famous uns …
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