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

7 votes

Subtlety in the definition of the Kobayashi metric

Let me give an example where $d \neq \delta$. I learned it from A Survey on Hyperbolicity of Projective Hypersurfaces, Example 1.2.1. Consider $D$ as the following open subset of $\mathbb C^2$ $$ D = …
Jorge Vitório Pereira's user avatar
3 votes

De Rham decomposition theorem, generalisations and good references

I suppose we have to ask the Riemannian manifold to be complete. Otherwise $\mathbb R^3 - \lbrace 0 \rbrace$ would be a counterexample. I do not have an answer to question 2, but you might be intere …
Jorge Vitório Pereira's user avatar