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The collar theorem and examples. (English) Zbl 0402.53028

MSC:
53C21 Methods of global Riemannian geometry, including PDE methods; curvature restrictions
53C22 Geodesics in global differential geometry
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References:
[1] Buser,P.: Riemannsche Flächen mit Eigenwerten in (0,1/4), Comment. Math. Helv.52, 25-34 (1977) · Zbl 0348.53027
[2] Chavel, I., Feldman, E.A.: Cylinders on surfaces, preprint · Zbl 0414.53032
[3] Cheeger, J., Ebin, D.G.: Comparison theorems in Riemannian geometry, Amsterdam: North Holland 1975 · Zbl 0309.53035
[4] Perron, O.: Nichteuklidische Elementargeometrie der Ebene, Stuttgart: Teubner 1962 · Zbl 0101.37403
[5] Randol, B., Cylinders in Riemann surfaces, preprint · Zbl 0401.30036
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