arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1909.03201math.AG
收藏

具有切线的奇异曲线的计数

Counting singular curves with tangencies

Anantadulal Paul

摘要:

我们得到了一个递归公式的次数$d$曲线在$\mathbb{P}^2$与指定的奇点(类型$A_k$)是切线到一个给定的线的示性数。该公式是以具有这些奇点的曲线的示性数表示的。结合S. Basu和R. Mukherjee,这给了我们一个完整的公式的示性数曲线的$δ$节点和一个奇点的类型$A_k$,切线到一个给定的线,提供$δ+ k \leq 8$。我们使用一种拓扑方法,即动态相交方法来计算退化对Euler类的贡献。直到余维8,我们验证了我们的数字在逻辑上与Caporaso-Harris之前计算的数字一致。我们还做了一个非平凡的低次检查,以验证我们的公式的尖点三次切线到一个给定的线,使用Kazarian的结果。

英文摘要:

We obtain a recursive formula for the characteristic number of degree $d$ curves in $\mathbb{P}^2$ with prescribed singularities (of type $A_k$) that are tangent to a given line. The formula is in terms of the characteristic number of curves with exactly those singularities. Combined with the results of S. Basu and R. Mukherjee, this gives us a complete formula for the characteristic number of curves with $δ$-nodes and one singularity of type $A_k$, tangent to a given line, provided $δ+ k \leq 8$. We use a topological method, namely the method of dynamic intersections to compute the degenerate contribution to the Euler class. Till codimension eight, we verify that our numbers are logically consistent with those computed earlier by Caporaso-Harris. We also make a non trivial low degree check to verify our formula for the number of cuspidal cubics tangent to a given line, using a result of Kazarian.

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。

↑