Tubular neighbourhoods of 2-flats in 4-manifolds of nonpositive curvature.

DOI10.1023/A:1011991221547zbMATH Open1034.53059OpenAlexW106154563MaRDI QIDQ5948673

Christoph Hummel

Publication date: 2001

Published in: Geometriae Dedicata (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1023/a:1011991221547

zbMATH Keywords

nonpositive curvatureclosed flatscusp-closing

Mathematics Subject Classification ID

Global submanifolds (53C40) Global Riemannian geometry, including pinching (53C20) Differential geometry of symmetric spaces (53C35)

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