Enumerating homotopy-ribbon slice discs
Enumerating homotopy-ribbon slice discs
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枚举同伦-带片圆盘
DOI:
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发表时间:
2019
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通讯作者:
Mark Powell
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作者:
Anthony Conway;Mark Powell
Let $Gamma$ be either the infinite cyclic group $mathbb{Z}$ or the Baumslag-Solitar group $mathbb{Z} ltimes mathbb{Z}[frac{1}{2}]$. Let $K$ be a slice knot admitting a slice disc $D$ in the 4-ball whose exterior has fundamental group $Gamma$. We classify the $Gamma$-homotopy ribbon slice discs for $K$ up to topological ambient isotopy rel. boundary using surgery theory. In the infinite cyclic case, there is a unique equivalence class of such slice discs. When $Gamma$ is the Baumslag-Solitar group, there is at most one $Gamma$-homotopy ribbon slice disc for each lagrangian of the Blanchfield pairing of $K$.