Bergelson–Hindman–Leader partition conjecture for the nonzero rationals

Let Q{0}\mathbb{Q}\setminus\{0\} be partitioned into finitely many sets,

Q{0}=i=1rAi.\mathbb{Q}\setminus\{0\}=\bigcup_{i=1}^{r}A_i.

For a sequence xnn=1\langle x_n\rangle_{n=1}^{\infty}, let FS(xnn=1)FS(\langle x_n\rangle_{n=1}^{\infty}) denote its finite sums and FP(xnn=1)FP(\langle x_n\rangle_{n=1}^{\infty}) its finite products. Bergelson–Hindman–Leader conjecture. There exists a finite partition

Q{0}=i=1rAi\mathbb{Q}\setminus\{0\}=\bigcup_{i=1}^{r}A_i

such that there do not exist i{1,2,,r}i\in\{1,2,\ldots,r\} and a sequence xnn=1\langle x_n\rangle_{n=1}^{\infty} with

FS(xnn=1)FP(xnn=1)Ai.FS(\langle x_n\rangle_{n=1}^{\infty})\cup FP(\langle x_n\rangle_{n=1}^{\infty})\subseteq A_i.

This extends the corresponding result for dyadic rational numbers; the source presents it as a conjecture from Bergelson, Hindman, and Leader, and its resolution is not indicated here.

Sources & referencesView supporting material

Primary source

Tanushree Biswas, “Combined Properties of Finite Sums And Finite products near zero”, arXiv:1703.01581 (2017).

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