Caustics of convex curves

Caustics of convex curves
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凸曲线的焦散

DOI:
10.1142/s0218216514500503
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发表时间:
2014
影响因子:
0.5
通讯作者:
M. Umehara
M. Umehara
中科院分区:
数学4区
文献类型:
--
作者:
Hiro Gounai;M. Umehara

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众所周知,给定的凸闭曲线γ的焦点集(即焦散的像)允许有奇点。本文对最多允许四个顶点的凸曲线焦点集的微分同胚型进行了分类。
It is well-known that the focal set (i.e. the image of the caustic) of a given convex closed curve γ admits singular points. In this paper, we classify the diffeomorphic type of focal sets of convex curves which admit at most four cusps.
无拐点的闭合平面曲线
DOI: 10.1090/s0002-9939-1991-1043406-7
发表时间: 2013
期刊: Proc. Amer. Math. Soc.
影响因子: --
作者:
S. Ohno;T. Ozawa and M. Umehara
通讯作者: T. Ozawa and M. Umehara