Nadirashvili Surface

(Differential Geometry)

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Differential Geometry
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What is Nadirashvili surface?

In differential geometry, a Nadirashvili surface is an immersed complete bounded minimal surface in R3 with negative curvature. The first example of such a surface was constructed by in . This simultaneously answered a question of Hadamard about whether there was an immersed complete bounded surface in R3 with negative curvature, and a question of Eugenio Calabi and Shing-Tung Yau about whether there was an immersed complete bounded minimal surface in R3. showed that a complete immersed surface in R3 cannot have constant negative curvature, and show that the curvature cannot be bounded above by a negative constant. So Nadirashvili's surface necessarily has points where the curvature is arbitrarily close to 0.

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