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Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.
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Conic neighborhoods ⇔ polyhedral
I am looking for a reference to the following fact (I can prove it
my-self, but it should be known for a century).
Let $X$ be a reasonable metric space such that each point has a spherical
neigh …