Roberto Frigerio
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Registered User
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Apr 28 |
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Alexandrov angles in Riemannian manifolds Dear Anton, thank you very much for your answer. A lemma about the strong upper angle appears in the book by Bridson and Haefliger (Proposition I.1.16). Using it I easily proved that the Alexandrov angle is not smaller than the Riemannian one: more precisely, for every fixed t the comparison angle for the triangle with vertices p, γ1(t) and γ2(s) tends to the Riemannian one when s tends to 0 (this obviously provides a lower bound on the Alexandrov angle). However, I still have problems in proving that the Riemannian angle is not smaller than the Alexandrov one... |
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Apr 26 |
asked | Alexandrov angles in Riemannian manifolds |
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Mar 26 |
awarded | ● Necromancer |
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Mar 26 |
answered | The number of cusps of higher-dimensional hyperbolic manifolds |
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Jan 26 |
awarded | ● Enthusiast |
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Jan 21 |
comment |
Examples of “exotic” induction @Denis: I had already put that proof from the book in my talk! |
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Jan 21 |
asked | Examples of “exotic” induction |
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Dec 10 |
comment |
Non-generating sets in a free group. Dear Ian, I am not sure I understand your last paragraph. If there are no folds available, then the map is not an isomorphism, right? |
