Abstract
An R-link is an n-component link L in \(S^3\) such that Dehn surgery on L yields \(\#^n(S^1 \times S^2)\). Every R-link L gives rise to a geometrically simply-connected homotopy 4-sphere \(X_L\), which in turn can be used to produce a balanced presentation of the trivial group. Adapting work of Gompf, Scharlemann, and Thompson, Meier and Zupan produced a family of R-links L(p, q; c/d), where the pairs (p, q) and (c, d) are relatively prime and c is even. Within this family, \(L(3,2;2n/(2n+1))\) induces the infamous trivial group presentation \(\langle x,y \, | \, xyx=yxy, x^{n+1}=y^n \rangle \), a popular collection of potential counterexamples to the Andrews–Curtis conjecture for \(n \ge 3\). In this paper, we use 4-manifold trisections to show that the group presentations corresponding to a different subfamily, L(3, 2; 4/d), are Andrews–Curtis trivial for all d.
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Acknowledgements
We are grateful to Jeffrey Meier for helpful conversations and for comments on an earlier draft of this paper. AZ was supported by NSF awards DMS-1664578 and DMS-2005518 and a Simons Fellowship during the completion of this work.
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Romary, E., Zupan, A. A family of Andrews–Curtis trivializations via 4-manifold trisections. Geom Dedicata 218, 45 (2024). https://doi.org/10.1007/s10711-024-00891-6
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DOI: https://doi.org/10.1007/s10711-024-00891-6