Conjectured unbounded imbalance for stretchable point configurations

For a finite set of points in the plane, consider every line determined by at least two points of the set, and compare the numbers of points on its two sides. Stretchable-configuration conjecture. There exists an unbounded function f:NNf:\mathbb{N}\rightarrow\mathbb{N} such that, for every natural number nn, there is a set of nn points for which the numbers of points on either side of each line determined by the set differ by at least f(n)f(n). The paper's construction establishes the analogous phenomenon for pseudoline arrangements, while the stretchability of such configurations remains open; the conjecture proposes that configurations realizable by lines can also exhibit unbounded imbalance.

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Primary source

David Conlon and Jeck Lim, “Everywhere unbalanced configurations”, arXiv:2308.02466 (2025).

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