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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影响因子:
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通讯作者:
Mark Powell
Mark Powell
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作者:
Anthony Conway;Mark Powell

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设$Gamma$是无限循环群$mathbb{Z}$或Baumslag-Solitar群$mathbb{Z} l乘以mathbb{Z}[frac{1}{2}]$。设K是一个切片纽结,在4-球中有一个切片圆盘D,其外部具有基本群Gamma.我们分类的$Gamma$同伦带状切片磁盘$K$拓扑环境合痕关系。边界利用外科理论。在无限循环的情况下,有一个唯一的等价类,这样的切片光盘。当$Gamma$是Baumslag-Solitar群时,对于$K$的Blanchfield对的每个拉格朗日量,最多有一个$Gamma$-同伦带状切片圆盘。
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 $K$.