Local surgery formulas for quantum invariants and the Arf invariant

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A formula for the Arf invariant of a link is given in terms of the singularities of an immersed surface bounded by the link. This is applied to study the computational complexity of quantum invariants of 3--manifolds.
Published by Geometry and Topology Monographs at http://www.maths.warwick.ac.uk/gt/GTMon7/paper9.abs.html

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