On 2-surfaces in R4 and Rn
Steffen Froehlich
Abstract
In this overview report we generalize Erhard Heinz' curvature estimate for minimal graphs in R3 to graphs in Rn of prescribed mean curvature. Secondly, we analyse these problems in the frame of the outer differential geometry which leads us to the notions of normal torsion and normal curvature for immersions in R4.
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