Circles and Quadratic Maps Between Spheres

Details Circles and Quadratic Maps Between Spheres Circles and Quadratic Maps Between Spheres

2002-12-06

arxiv.org/abs/math/0212098v3

Mathematics

Metric Geometry

14 pages, v3: minor changes to improve readability

Scientific paper

Consider an analytic map of a neighborhood of 0 in a vector space to a Euclidean space. Suppose that this map takes all germs of lines passing through 0 to germs of circles. Such a map is called rounding. We introduce a natural equivalence relation on roundings and prove that any rounding, whose differential at 0 has rank at least 2, is equivalent to a fractional quadratic rounding. A fractional quadratic map is just the ratio of a quadratic map and a quadratic polynomial. We also show that any rounding gives rise to a quadratic map between spheres. The known results on quadratic maps between spheres have some interesting implications concerning roundings.

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