English

Star points on smooth hypersurfaces

Algebraic Geometry 2009-03-12 v1

Abstract

A point P on a smooth hypersurface X of degree d in an N-dimensional projective space is called a star point if and only if the intersection of X with the embedded tangent space T_P(X) is a cone with vertex P. This notion is a generalization of total inflection points on plane curves and Eckardt points on smooth cubic surfaces in three-dimensional projective space. We generalize results on the configuration space of total inflection points on plane curves to star points. We give a detailed description of the configuration space for hypersurfaces with two or three star points. We investigate collinear star points and we prove that the number of star points on a smooth hypersurface is finite.

Keywords

Cite

@article{arxiv.0903.2005,
  title  = {Star points on smooth hypersurfaces},
  author = {Filip Cools and Marc Coppens},
  journal= {arXiv preprint arXiv:0903.2005},
  year   = {2009}
}

Comments

30 pages, 1 figure

R2 v1 2026-06-21T12:20:46.511Z