The weak Loneliness Spectrum Conjecture for one very fast speed

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Let n≥4n\geq4 be an integer. For positive integers v1<⋯<vnv_1<\cdots<v_n, define

ML⁡(v1,…,vn)=max⁡t∈Rmin⁡1≤i≤n∥tvi∥.\operatorname{ML}(v_1,\ldots,v_n)=\max_{t\in\mathbb{R}}\min_{1\leq i\leq n}\Vert tv_i\Vert.

Weak Loneliness Spectrum Conjecture. For every integer n≥4n\geq4, there exists a function fn:N→Nf_n:\mathbb{N}\to\mathbb{N} such that, whenever vn>fn(vn−1)v_n>f_n(v_{n-1}), either

ML⁡(v1,…,vn)=sns+1for some s∈N,\operatorname{ML}(v_1,\ldots,v_n)=\frac{s}{ns+1}\quad\text{for some }s\in\mathbb{N},

or

ML⁡(v1,…,vn)≥1n.\operatorname{ML}(v_1,\ldots,v_n)\geq\frac{1}{n}.

This is a regime-specific refinement of the Loneliness Spectrum Conjecture, addressing sets of speeds with one speed sufficiently larger than the preceding one. The paper proves a stronger explicit bound for n=4n=4 and n=6n=6, but the assertion for every n≥4n\geq4 remains open.

References

Primary source

Noah Kravitz, “Barely lonely runners and very lonely runners”, arXiv:1912.06034 (2019).

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