Characterizations of knot groups and knot symmetric quandles of surface-links

Jumpei Yasuda

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arXiv · 2412.20081

Characterizations of knot groups and knot symmetric quandles of surface-links

Jumpei Yasuda

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Abstract

The knot group is the fundamental group of a knot or link complement. A necessary and sufficient conditions for a group to be realized as the knot group of some link was provided. This result was shown using the closed braid method. Gonz\'alez-Acu\~na and Kamada independently extended this characterization to the knot groups of orientable surface-links. Kamada applied the closed 2-dimensional braid method to show this result. In this paper, we generalize these results to characterize the knot groups of surface-links, including non-orientable ones. We use a plat presentation for surface-links to prove it. Furthermore, we show a similar characterization for the knot symmetric quandles of surface-links. As an application, we show that every dihedral quandle with an arbitrarily good involution can be realized as the knot symmetric quandle of a surface-link.

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Jumpei Yasuda. 2024-12-28. Characterizations of knot groups and knot symmetric quandles of surface-links. https://arxiv.org/abs/2412.20081

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