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A counterexample to Nirenberg's conjecture on closed asymptotic curves

Banks, Harrison et al.
arXiv (All) · Papers
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differential-geometry
We construct a smooth embedded annulus in $R^3$ with negative Gauss curvature in its interior whose boundary consists of two strictly convex curves in planes tangent to the annulus, and which contains two closed asymptotic curves. This gives a counterexample to a 1962 conjecture of Nirenberg. The co
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