Quadratic counts of highly tangent lines to hypersurfaces
Algebraic Geometry
2025-11-18 v2
Abstract
We give two geometric interpretations for the local type of a line that is highly tangent to a hypersurface in a single point. One interpretation is phrased in terms of the Wronski map, while the other interpretation relates to the fundamental forms of the hypersurface. These local types are the local contributions of an quadratic form-valued Euler number that depends on a choice of orientation.
Cite
@article{arxiv.2504.21664,
title = {Quadratic counts of highly tangent lines to hypersurfaces},
author = {Stephen McKean and Giosuè Muratore and Wern Juin Gabriel Ong},
journal= {arXiv preprint arXiv:2504.21664},
year = {2025}
}
Comments
19 pages. Final version