Nonisolated spacelike focal and conjugate points in Lorentzian geometry
JOURNAL OF MATHEMATICAL PHYSICS(2009)
摘要
Nonisolated focal and conjugate points along a spacelike geodesic are investigated. We give examples of nonisolated focal points and provide conditions for such phenomenon motivated by Helfer's example of nonisolated conjugate points and Kupeli's definitions of degenerate focal and conjugate points.
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关键词
differential geometry
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