Chen–Lev strengthened conjecture on explicit Hilbert-cube pairs

Let CC and DD be different sets of nonnegative integers satisfying

CD=N,C\cup D=\mathbb N, CD=r+mN,C\cap D=r+m\mathbb N,

for integers r0r\ge0 and m2m\ge2, and let RC(n)R_C(n) and RD(n)R_D(n) denote their two-element representation functions.

Chen–Lev strengthened conjecture. If RC(n)=RD(n)R_C(n)=R_D(n) for every positive integer nn, then there exists an integer l1l\ge1 such that

C=H0(1,2,4,8,,22l1,22l1,22l+11,2(22l+11),4(22l+11),8(22l+11),),C=H_0(1,2,4,8,\dots,2^{2l-1},2^{2l}-1,2^{2l+1}-1,2(2^{2l+1}-1),4(2^{2l+1}-1),8(2^{2l+1}-1),\dots), D=H1(1,2,4,8,,22l1,22l1,22l+11,2(22l+11),4(22l+11),8(22l+11),).D=H_1(1,2,4,8,\dots,2^{2l-1},2^{2l}-1,2^{2l+1}-1,2(2^{2l+1}-1),4(2^{2l+1}-1),8(2^{2l+1}-1),\dots).

This is explicitly described as a stronger version of the Chen–Lev question and would identify the sets themselves, not only the parameters of their periodic intersection. The source supplies no resolution.

Sources & referencesView supporting material

Primary source

Sándor Z. Kiss and Csaba Sándor, “On the structure of sets which have coinciding representation functions”, arXiv:1702.04499 (2020).

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