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Manifolds without focal points. (English) Zbl 0424.53021


MSC:

53C20 Global Riemannian geometry, including pinching
53C22 Geodesics in global differential geometry
37D40 Dynamical systems of geometric origin and hyperbolicity (geodesic and horocycle flows, etc.)
53D25 Geodesic flows in symplectic geometry and contact geometry
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