Skew loops and quadric surfaces

Details Skew loops and quadric surfaces Skew loops and quadric surfaces

2002-05-21

arxiv.org/abs/math/0205222v2

Mathematics

Differential Geometry

14 pages, no figures; 11/02 revision corrects a small error in the original manuscript

Scientific paper

A skew loop is a closed curve without parallel tangent lines. We prove: The only complete surfaces in euclidean 3-space with a point of positive curvature and no skew loops are the quadrics. In particular, ellipsoids are the only closed surfaces without skew loops. We also prove results about skew loops on cylinders and positively curved surfaces.

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