Tolerance complexes of collapsible complexes are Leray

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Let KK be a dd-collapsible simplicial complex, and let t≥0t\geq 0. Define the tt-tolerance complex of KK by

Tt(K)={η∪τ:η∈K, τ⊂V, ∣τ∣≤t}.\mathcal{T}_{t}(K)=\{\eta\cup\tau:\eta\in K,\ \tau\subset V,\ |\tau|\leq t\}.

Collapsible-to-Leray tolerance conjecture. Then Tt(K)\mathcal{T}_{t}(K) is (η(d+1,t+1)−1)(\eta(d+1,t+1)-1)-Leray.

This is stated as a weaker version of the conjectures asserting preservation of collapsibility and Lerayness under the same tolerance operation. The source gives no resolution of this conjecture, although it records special cases, including the d=2d=2, t=1t=1 case.

References

Primary source

Minki Kim and Alan Lew, “Leray numbers of tolerance complexes”, arXiv:2109.03030 (2021).

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