Branched immersions and braids

Details Branched immersions and braids Branched immersions and braids

2007-01-28

arxiv.org/abs/math/0701816v1

Mathematics

Differential Geometry

Scientific paper

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.

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