3-manifolds with(out) metrics of nonpositive curvature.
Bernhard Leeb (1995)
Inventiones mathematicae
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Bernhard Leeb (1995)
Inventiones mathematicae
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Ganchev, Georgi, Kassabov, Ognian (2007)
Serdica Mathematical Journal
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2000 Mathematics Subject Classification: Primary 53B35, Secondary 53C50. In dimension greater than four, we prove that if a Hermitian non-Kaehler manifold is of pointwise constant antiholomorphic sectional curvatures, then it is of constant sectional curvatures.
V. Schroeder, M.T. Anderson (1986)
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Giovanni Battista Rizza (1988)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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Almost hermitian manifolds, whose Riemann curvature tensor satisfies an almost complex Bianchi-type identity, are considered. Some local and global theorems are proved. The special cases of parakähler manifolds and of Kähler manifolds are examined.
Kinetsu Abe (1979)
Inventiones mathematicae
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H. Wu, R.E. Greene (1974)
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K.D. Elworthy, Steven Rosenberg (1991)
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J.-H. Eschenburg (1982)
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Wing-Keung To (1989)
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S. Bando, A. Kasue, H. Nakajima (1989)
Inventiones mathematicae
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