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Slicing degree of knots

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arxiv 2404.15991 v1 pith:ABK53BWF submitted 2024-04-24 math.GT

classification math.GT
keywords knotsslicingdegreedegreeshomologyknotsomebounds
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abstract

The slicing degree of a knot $K$ is defined as the smallest integer $k$ such that $K$ is $k$-slice in $\#^n \overline{\mathbb{CP}^2}$ for some $n$. In this paper, we establish bounds for the slicing degrees of knots using Rasmussen's $s$-invariant, knot Floer homology and singular instanton homology. We compute the slicing degrees for many small knots (with crossing numbers up to $9$) and for some families of torus knots.

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  1. Simply slicing knots

    math.GT 2025-07 conditional novelty 7.0 of 10

    A knot K bounds a locally flat Z_d-disc representing a class x of divisibility d in a simply-connected 4-manifold N iff its Arf invariant matches a congruence and b_2(N) dominates all Levine-Tristram signature bounds.

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