A reduction conjecture for the complexes Γnα,r\Gamma_n^{\alpha,r}

For fixed m>0m>0, let Gmn\mathcal{G}_m^n, Δmn,r\Delta_m^{n,r}, and Γnα,r\Gamma_n^{\alpha,r} be the complexes defined in the paper. Let V(Δ)V(\Delta) denote the vertex set of an induced subcomplex Δ\Delta of Γnα,r\Gamma_n^{\alpha,r}. Reduction conjecture. If rn2r\geq n\geq 2, then Γnα,r\Gamma_n^{\alpha,r} is homotopy equivalent to an induced subcomplex Δ\Delta such that every xV(Δ)x\in V(\Delta) satisfies

xi<r2for all i[n]|x_i|<\left\lfloor\frac{r}{2}\right\rfloor\quad\text{for all }i\in[n]

and, for every S[n]S\subseteq[n] with Card(S)=n2\operatorname{Card}(S)=n-2,

iSxir2.\sum_{i\in S}|x_i|\leq r-2.

The conjecture is proposed as a possible generalization of the reduction lemmas used in the paper. Its resolution would provide a systematic homotopy reduction for these complexes in arbitrary dimension.

Sources & referencesView supporting material

Primary source

Raju Kumar Gupta, Sourav Sarkar and Samir Shukla, “On the Vietoris-Rips Complexes of Integer Lattices”, arXiv:2511.04238 (2025).

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