Sextactic points on a simple closed curve
Sextactic points on a simple closed curve
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简单闭合曲线上的六位点
DOI:
10.1017/s0027763000025435
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发表时间:
2000
影响因子:
0.8
通讯作者:
M. Umehara
中科院分区:
文献类型:
--
作者:
G. Thorbergsson;M. Umehara
Abstract We give optimal lower bounds for the number of sextactic points on a simple closed curve in the real projective plane. Sextactic points are after inflection points the simplest projectively invariant singularities on such curves. Our method is axiomatic and can be applied in other situations.