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arXiv 0905.3488math.GT
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表面结的宽度

Widths of surface knots

Yasushi Takeda

摘要:

本文利用一般的平面投影研究四维空间中的曲面结点。这些投影具有作为其奇点的折叠点和尖点,并且奇点集的图像将平面分成若干区域。表面结的宽度(或总宽度)是与每个区域中的点的逆像中的点的数量相关的数值不变量。我们确定某些表面结的宽度,并表征那些表面结的总宽度小。还研究了表面编织指数的关系。

英文摘要:

We study surface knots in 4-space by using generic planar projections. These projections have fold points and cusps as their singularities and the image of the singular point set divides the plane into several regions. The width (or the total width) of a surface knot is a numerical invariant related to the number of points in the inverse image of a point in each of the regions. We determine the widths of certain surface knots and characterize those surface knots with small total widths. Relation to the surface braid index is also studied.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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