数学物理学报(英文版) ›› 2022, Vol. 42 ›› Issue (2): 437-453.doi: 10.1007/s10473-022-0201-1

• 论文 •    下一篇

UNDERSTANDING SCHUBERT'S BOOK (III)

李绑河   

  1. KLMM, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2021-02-01 修回日期:2021-03-22 出版日期:2022-04-25 发布日期:2022-04-22
  • 作者简介:Banghe LI,E-mail:libh@amss.ac.cn
  • 基金资助:
    This work was partially supported by National Center for Mathematics and Interdisciplinary Sciences, CAS.

UNDERSTANDING SCHUBERT'S BOOK (III)

Banghe LI   

  1. KLMM, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2021-02-01 Revised:2021-03-22 Online:2022-04-25 Published:2022-04-22
  • Supported by:
    This work was partially supported by National Center for Mathematics and Interdisciplinary Sciences, CAS.

摘要: In §13 of Schubert's famous book on enumerative geometry, he provided a few formulas called coincidence formulas, which deal with coincidence points where a pair of points coincide. These formulas play an important role in his method. As an application, Schubert utilized these formulas to give a second method for calculating the number of planar curves in a one dimensional system that are tangent to a given planar curve. In this paper, we give proofs for these formulas and justify his application to planar curves in the language of modern algebraic geometry. We also prove that curves that are tangent to a given planar curve is actually a condition in the space of planar curves and other relevant issues.

关键词: Hilbert problem 15, enumeration geometry, coincidence formula

Abstract: In §13 of Schubert's famous book on enumerative geometry, he provided a few formulas called coincidence formulas, which deal with coincidence points where a pair of points coincide. These formulas play an important role in his method. As an application, Schubert utilized these formulas to give a second method for calculating the number of planar curves in a one dimensional system that are tangent to a given planar curve. In this paper, we give proofs for these formulas and justify his application to planar curves in the language of modern algebraic geometry. We also prove that curves that are tangent to a given planar curve is actually a condition in the space of planar curves and other relevant issues.

Key words: Hilbert problem 15, enumeration geometry, coincidence formula

中图分类号: 

  • 14H50