A C 0 Estimate for Nearly Umbilical Surfaces
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Let Σ ⊂ R 3 be a smooth compact connected surface without boundary. Denote by A its second fundamental form and by Å the tensor A−(tr A/2)Id. In  we proved that, if ‖Å‖ L 2 (Σ) is small, then Σ is W 2,2-close to a round sphere. In this note we show that, in addition, the metric of Σ is C 0–close to the standard metric of S 2.
KeywordsHardy Space Fundamental Form Universal Constant Beltrami Operator Round Sphere
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- 2.De Lellis, C., Müller, S.: Optimal rigidity estimates for nearly umbilical surfaces, to appear in J. Diff. Geom.Google Scholar