Pach's conjecture on tangencies among precisely 1-intersecting curves
Pach's conjecture on tangencies among precisely 1-intersecting curves
Let a family of planar curves be precisely 1-intersecting if every pair of curves has precisely one common point, either a crossing or a tangency, and assume that no three curves share a common point. Pach's conjecture. Every family of precisely -intersecting planar curves in which no three curves share a common point admits tangencies.
This conjecture concerns the extremal number of tangencies in arrangements of pseudo-segments. It was settled by the authors for -monotone curves, while the general case stated here is resolved according to the supplied status.
Sources & referencesView supporting material
Primary source
Eyal Ackerman and Balázs Keszegh, “On the maximum number of tangencies among 1-intersecting curves”, arXiv:2603.11885 (2026).
Progress summary
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