Branched immersions and braids
Differential Geometry
2007-05-23 v1 Geometric Topology
Abstract
Branch points of a real 2-surface S in a 4-manifold M generalize the branch points of complex curves in complex surfaces: for example, they can occur as singularities of minimal surfaces. We investigate such a branch point p when S is topologically embedded in M. It defines a link L(p), the components of which are closed braids with the same axis up to orientation. If S is closed without boundary, the contribution of p to the degree of the normal bundle of S in M can be computed on the link L(p) in terms of the algebraic crossing numbers of its components and on their linking numbers one with another.
Cite
@article{arxiv.math/0701816,
title = {Branched immersions and braids},
author = {Marina Ville},
journal= {arXiv preprint arXiv:math/0701816},
year = {2007}
}