Abstract
We consider complete nonpositively curved surfaces with one end twice continuously differentiably immersed in Euclidean three space. If such a surface is embedded near infinity and has square integrable second fundamental form then it must lie between two parallel planes.
Citation
Hsungrow Chan. Andrejs Treibergs. "Nonpositively Curved Surfaces in R3." J. Differential Geom. 57 (3) 389 - 407, March, 2001. https://doi.org/10.4310/jdg/1090348127
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