The infinite nested sumsets conjecture

Let ANA\subset\mathbb{N} have positive upper Banach density. For an infinite sequence of infinite sets B1,B2,NB_1,B_2,\ldots\subset\mathbb{N}, define B1++BiB_1+\cdots+B_i in the usual way.

Infinite nested sumsets conjecture. There is an infinite sequence of infinite sets B1,B2,NB_1,B_2,\ldots\subset\mathbb{N} such that

B1++BiAfor every iN.B_1+\cdots+B_i\subset A\qquad\text{for every }i\in\mathbb{N}.

This strengthens the finite nested sumsets conjecture by requiring one sequence to work for every order. It is posed as an open strengthening.

Sources & referencesView supporting material

Primary source

Bryna Kra, Joel Moreira, Florian K. Richter and Donald Robertson, “Problems on infinite sumset configurations in the integers and beyond”, arXiv:2311.06197 (2025).

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