On the tangentially degenerate curves, II

On the tangentially degenerate curves, II
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在切向简并曲线上,II

DOI:
10.1007/s00574-014-0072-8
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发表时间:
2014
期刊:
Bulletin of the Brazilian Mathematical Society, New Series
影响因子:
--
通讯作者:
Hajime
Hajime
中科院分区:
--
文献类型:
--
作者:
KAJI;Hajime

文献摘要

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如果在一般点处的切线x与在非p点处的切线x相遇,则表示在广义上简并的投影曲线。在本文中,我们证明了如果x在特征零点处切简并,则x在一定条件下包含在2平面上。我们还研究了E. Esteves和M. Homma在正特征情况下的反例,并提出了我们的调查导致的一个猜想。
A projective curveXin ℙNis said to betangentially degenerateif a tangent line toXat a general pointPmeetsXagain at a point other thanP. In this article, we prove that ifXis tangentially degenerate in characteristic zero, thenXis contained in a 2-plane under a certain condition on singularities ofX. We also investigate a counter-example of E. Esteves and M. Homma in positive characteristic case, and present a conjecture that our investigation leads to.