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arXiv 2604.01697math.GTmath.GR
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Dehn filling和knot group II: persistent elements的普遍性

Dehn filling and the knot group II: Ubiquity of persistent elements

Kyoto University(京都大学);Nihon University(日本大学);Hiroshima University(广岛大学)

Tetsuya Ito, Kimihiko Motegi, Masakazu Teragaito

AI总结:

研究非平凡结的Dehn填充下持久元素的存在性,证明每非平凡结群中存在无限多个持久元素,且这些元素在群结构中广泛分布。

摘要:

研究非平凡结的Dehn填充下持久元素的存在性,证明每非平凡结群中存在无限多个持久元素,且这些元素在群结构中广泛分布。

英文摘要:

Let $K$ be a nontrivial knot in $S^3$. We say that an element of the knot group $G(K)$ is \textit{persistent} if it remains nontrivial under all nontrivial Dehn fillings. Such elements exist for every nontrivial knot. Indeed, Property P is equivalent to the statement that the meridian of $K$ is a persistent element, and this represents the first instance of such elements. Building on the solution to the Property P conjecture due to Kronheimer and Mrowka, we show that every nontrivial knot group admits infinitely many persistent elements with pairwise disjoint automorphic orbits, none of which contains a power of the meridian. We then develop this further to show that for a broad class of hyperbolic knots - namely those admitting no surgery whose resulting manifold has torsion in its fundamental group - persistent elements are not rare curiosities, but rather structurally pervasive in $G(K)$. This is reflected in the following two properties: (i) Every subgroup of $G(K)$ that is not contained in the normal closure of a peripheral element contains persistent elements. (ii) Persistent elements exist outside every proper subgroup of $G(K)$.

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