Hyperbolic analogue of the Bezdek–Connelly–Kertész average-degree conjecture

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Let Pr{\mathcal P}_r be a packing of disks of radius r>0r>0 in the hyperbolic plane H2\mathbb{H}^{2}, and let deg⁡avr(Pr){\rm \deg}_{\rm avr}({\mathcal P}_r) denote the average degree of its contact graph. Hyperbolic average-degree conjecture. For arbitrary such packings,

lim sup⁡r→0(sup⁡Prdeg⁡avr(Pr))<5.\limsup_{r\to 0}\left(\sup_{{\mathcal P}_r}{\rm \deg}_{\rm avr}({\mathcal P}_r)\right)<5.

This is the still-open hyperbolic counterpart of the corresponding spherical result, which is known.

References

Primary source

Karoly Bezdek and Muhammad A. Khan, “Contact numbers for sphere packings”, arXiv:1601.00145 (2016).

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