TY - JOUR

T1 - The topology of an open manifold with radial curvature bounded from below by a model surface with finite total curvature and examples of model surfaces

AU - Tanaka, Minoru

AU - Kondo, Kei

N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

PY - 2013/3

Y1 - 2013/3

N2 - We construct distinctive surfaces of revolution with finite total curvature whose Gauss curvatures are not bounded.Such a surface of revolution is employed as a reference surface of comparison theorems in radial curvature geometry. Moreover, we prove that a complete noncompact Riemannian manifold M is homeomorphic to the interior of a compact manifold with boundary if the manifold M is not less curved than a noncompact model surface M̃ of revolution and if the total curvature of the model surface M̃ is finite and less than 2π. By the first result mentioned above, the second result covers a much wider class of manifolds than that of complete noncompact Riemannian manifolds whose sectional curvatures are bounded from below by a constant.

AB - We construct distinctive surfaces of revolution with finite total curvature whose Gauss curvatures are not bounded.Such a surface of revolution is employed as a reference surface of comparison theorems in radial curvature geometry. Moreover, we prove that a complete noncompact Riemannian manifold M is homeomorphic to the interior of a compact manifold with boundary if the manifold M is not less curved than a noncompact model surface M̃ of revolution and if the total curvature of the model surface M̃ is finite and less than 2π. By the first result mentioned above, the second result covers a much wider class of manifolds than that of complete noncompact Riemannian manifolds whose sectional curvatures are bounded from below by a constant.

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U2 - 10.1215/00277630-1959451

DO - 10.1215/00277630-1959451

M3 - Article

AN - SCOPUS:84879204232

VL - 209

SP - 23

EP - 34

JO - Nagoya Mathematical Journal

JF - Nagoya Mathematical Journal

SN - 0027-7630

ER -