Mathematics – Differential Geometry
Scientific paper
2011-06-19
Mathematics
Differential Geometry
11 pages
Scientific paper
We observe that the maximal open set of constant curvature k in a Riemannian
manifold with curvature bounded below or above by k has a convexity type
property, which we call "two-convexity". This statement is used to prove a
number of rigidity statements in comparison geometry.
Panov Dmitri
Petrunin Anton
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