Abstract
In this lecture, we show that the only way of changing the framing of a knot or a link by ambient isotopy in an oriented 3-manifold is when the manifold has a properly embedded non-separating sphere. This change of framing is given by the Dirac trick, also known as the light bulb trick. We begin with background information on non-separating spheres, Dehn homeomorphisms, and map** class groups of 3-manifolds. The main tools used in the proof are based on Darryl McCullough’s work on the map** class groups of 3-manifolds and spin structures. We then relate these results to the theory of skein modules.
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Przytycki, J.H., Bakshi, R.P., Ibarra, D., Montoya-Vega, G., Weeks, D. (2024). Spin Structure and the Framing Skein Module of Links in 3-Manifolds. In: Lectures in Knot Theory. Universitext. Springer, Cham. https://doi.org/10.1007/978-3-031-40044-5_15
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