The affine partition-of-unity conjecture for simplicial polytopes and homology spheres

Let 2i(d1)/22\leq i\leq (d-1)/2. Let (Δ,p)(\Delta,p) be either the boundary complex of a simplicial dd-polytope with its natural embedding pp, or a Z/2Z\mathbb Z/2\mathbb Z-homology (d1)(d-1)-sphere with a generic embedding pp. Write Sia(Δ,p)\mathcal S^a_i(\Delta,p) for the space of affine ii-stresses and st(v)\operatorname{st}(v) for the star of vv.

Affine partition-of-unity conjecture.

Sia(Δ,p)=vV(Δ)Sia(st(v),p).\mathcal S^a_i(\Delta,p)=\sum_{v\in V(\Delta)}\mathcal S^a_i(\operatorname{st}(v),p).

This asks whether every affine ii-stress is generated by stresses supported on vertex stars, paralleling the known linear-stress partition-of-unity result. The source gives no resolution.

Sources & referencesView supporting material

Primary source

Isabella Novik and Hailun Zheng, “Affine stresses: the partition of unity and Kalai's reconstruction conjectures”, arXiv:2208.06693 (2024).

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