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

Let n3n\geq 3, k1k\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.

Sources & referencesView supporting material

Primary source

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

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