Colorful four-point piercing conjecture for two families of circles

Let F1\mathcal{F}_{1} and F2\mathcal{F}_{2} be finite families of circles in R2\mathbb{R}^{2}. Suppose that ABA \cap B \neq \emptyset for every AF1A \in \mathcal{F}_{1} and BF2B \in \mathcal{F}_{2}.

Colorful four-point piercing conjecture. Either F1\mathcal{F}_{1} or F2\mathcal{F}_{2} can be pierced by 44 points.

This is proposed as a colorful analogue of Danzer's four-point piercing theorem for pairwise intersecting families of circles. The source presents it as a future-work conjecture and gives no resolution.

Sources & referencesView supporting material

Primary source

Cuauhtemoc Gomez-Navarro and Edgardo Roldán-Pensado, “Transversals to colorful intersecting convex sets”, arXiv:2305.16760 (2023).

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