Hurwitz Equivalence of Braid Group Factorizations Consisting of a Semi-Frame

Details Hurwitz Equivalence of Braid Group Factorizations Consisting of a Semi-Frame Hurwitz Equivalence of Braid Group Factorizations Consisting of a Semi-Frame

2002-09-17

arxiv.org/abs/math/0209209v1

Mathematics

Algebraic Geometry

Scientific paper

In this paper we prove certain Hurwitz equivalence properties in the braid group. Our main result is that every two factorizations of $\Delta_n ^2$ where the elements of the factorization are semi-frame are Hurwitz equivalent. The results of this paper are generalization of the results in \cite{B4}. We use a new presentation of the braid group, called the Birman-Ko-Lee presentation, to define the semi-frame structure. The main result of this paper can be applied to compute the BMT invariant of surfaces. The BMT is the class of Hurwitz equivalent factorizations of the central element of the braid group. The BMT distinguish among diffeomorphic surfaces which are not deformation of each other.

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