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Global differential geometry. --- Ricci flow. --- Riemannian manifolds.
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Evolution equations --- Asymptotic expansions. --- Curvature. --- Singularities (Mathematics) --- Équations d'évolution --- Développements asymptotiques. --- Courbure. --- Singularités (mathématiques) --- Asymptotic theory. --- Théorie asymptotique. --- Asymptotic expansions --- Curvature --- Asymptotic developments --- Asymptotic theory in evolution equations --- Asymptotic theory --- Développements asymptotiques --- Courbure --- Singularités (Mathématiques) --- Théorie asymptotique --- Geometry, Algebraic --- Calculus --- Curves --- Surfaces --- Asymptotes --- Convergence --- Difference equations --- Divergent series --- Functions --- Numerical analysis
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The authors study noncompact surfaces evolving by mean curvature flow (mcf). For an open set of initial data that are C^3-close to round, but without assuming rotational symmetry or positive mean curvature, the authors show that mcf solutions become singular in finite time by forming neckpinches, and they obtain detailed asymptotics of that singularity formation. The results show in a precise way that mcf solutions become asymptotically rotationally symmetric near a neckpinch singularity.
Evolution equations --- Asymptotic expansions. --- Curvature. --- Singularities (Mathematics) --- Asymptotic theory.
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