Exact top-dimensional homology rank conjecture for independence complexes of Kneser graphs

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Let n≥3n\geq 3, k≥1k\geq 1, and let Ind⁡(KG⁡(n,k))\operatorname{Ind}(\operatorname{KG}(n,k)) denote the independence complex of the Kneser graph. Set

p=12(2nn)−1.p=\frac{1}{2}\binom{2n}{n}-1.

Exact homology-rank conjecture. The rank of the pp-dimensional homology group of Ind⁡(KG⁡(n,k))\operatorname{Ind}(\operatorname{KG}(n,k)) is

(2n+k2n).\binom{2n+k}{2n}.

The conjecture is motivated by computed results for n=3n=3 and k=1,2,3k=1,2,3, where the lower bound proved earlier in the paper is attained. Its validity beyond those computations remains open.

References

Primary source

Ziqin Feng and Guanghui Wang, “Exploring Homological Properties of Independent Complexes of Kneser Graphs”, arXiv:2404.10566 (2024).

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