The 2R-Conjecture for cluster gaps in the Hegselmann–Krause model

Let R>0R>0 be the interaction radius, and consider the Hegselmann–Krause dynamics in the restricted setting with NN points on a compact interval. A fixed point consists of clusters of co-located points, separated by gaps between consecutive clusters. The 2R-Conjecture. As NN tends to infinity, the gaps between the clusters in the fixed point are approximately 2R2R. This is a classical qualitative conjecture, but the source notes that no precise meaning of “approximately” has yet been established in the literature, and the conjecture remains unresolved.

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Primary source

Partha S. Dey, S. Rasoul Etesami and Aditya S. Gopalan, “The 2R-Conjecture for the Hegselmann–Krause Model: A Proof in Expectation and New Directions”, arXiv:2508.08299 (2025).

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