Finiteness conjecture for extendable automorphisms of embedded tori

Let TpT^p be a pp-dimensional torus embedded in Sp+2S^{p+2}. Consider extendable homeomorphisms of the embedding, and distinguish their mapping classes in MCG(Tp)\operatorname{MCG}(T^p) from their linear mapping classes in SL(p,Z)\operatorname{SL}(p,\mathbb{Z}). Higher-dimensional torus finiteness conjecture. There is some TpT^p embedded in Sp+2S^{p+2} such that it has finitely many mapping classes in MCG(Tp)\operatorname{MCG}(T^p) or linear mapping classes in SL(p,Z)\operatorname{SL}(p,\mathbb{Z}) of extendable homeomorphisms. This is posed as a possible higher-dimensional analogue of the preceding surface question; the source gives no resolution.

Sources & referencesView supporting material

Primary source

Qiling Liu, “Knotted surfaces, Homological Norm and Extendable Subgroup”, arXiv:2511.03648 (2025).

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