On the Theory of Surfaces in the Four-dimensional Euclidean Space

Details On the Theory of Surfaces in the Four-dimensional Euclidean Space On the Theory of Surfaces in the Four-dimensional Euclidean Space

2007-08-26

arxiv.org/abs/0708.3480v1

Kodai Math. J., 31 (2008), 183-198

Mathematics

Differential Geometry

14 pages

Scientific paper

For a two-dimensional surface in the four-dimensional Euclidean space we introduce an invariant linear map of Weingarten type in the tangent space of the surface, which generates two invariants k and kappa. The condition k = kappa = 0 characterizes the surfaces consisting of flat points. The minimal surfaces are characterized by the equality kappa^2=k. The class of the surfaces with flat normal connection is characterized by the condition kappa = 0. For the surfaces of general type we obtain a geometrically determined orthonormal frame field at each point and derive Frenet-type derivative formulas. We apply our theory to the class of the rotational surfaces, which prove to be surfaces with flat normal connection, and describe the rotational surfaces with constant invariants.

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