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arXiv 1505.00543math.APmath.DG
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几乎图超曲面在中曲率流下成为图超曲面

Almost graphical hypersurfaces become graphical under mean curvature flow

Ananda Lahiri

摘要:

考虑欧几里得空间中超曲面的中曲率流,该超曲面最初在圆柱内是图形的。存在一段时间,在这段时间内,流动在半径为一半的圆柱体内是图解的。在这里,我们证明了一个下界在此期间取决于Lipschitz常数的初始图形表示。这是用来处理一个中曲率流,位于平板内,最初是图形内的一个圆柱体,除了一个小的集。我们表明,这样的流动将成为图形内的圆柱半径的一半。证明主要是基于怀特的正则性定理。

英文摘要:

Consider a mean curvature flow of hypersurfaces in Euclidean space, that is initially graphical inside a cylinder. There exists a period of time during which the flow is graphical inside the cylinder of half the radius. Here we prove a lower bound on this period depending on the Lipschitz-constant of the initial graphical representation. This is used to deal with a mean curvature flow that lies inside a slab and is initially graphical inside a cylinder except for a small set. We show that such a flow will become graphical inside the cylinder of half the radius. The proofs are mainly based on White's regularity theorem.

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