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Contact structures and reducible surgeries

Published online by Cambridge University Press:  24 September 2015

Tye Lidman
Affiliation:
Mathematics Department, The University of Texas at Austin, RLM 8.100, 2515 Speedway Stop C1200, Austin, TX 78712-1202, USA email tlid@math.utexas.edu
Steven Sivek
Affiliation:
Department of Mathematics, Princeton University, Fine Hall, Washington Road, Princeton, NJ 08544-1000, USA email ssivek@math.princeton.edu
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Abstract

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We apply results from both contact topology and exceptional surgery theory to study when Legendrian surgery on a knot yields a reducible manifold. As an application, we show that a reducible surgery on a non-cabled positive knot of genus $g$ must have slope $2g-1$, leading to a proof of the cabling conjecture for positive knots of genus 2. Our techniques also produce bounds on the maximum Thurston–Bennequin numbers of cables.

Type
Research Article
Copyright
© The Authors 2015 

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