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October 8, 20250 citationsOpen Access

Automated Symmetric Constructions in Discrete Geometry

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BSBernardo SubercaseauxEMEthan MackeyLQLong Qian

Key Points

  • The approach discovers symmetric extremal solutions to the Erdős-Szekeres problem, showcasing the power of computational geometry.
  • A novel local-search realizability solver improves practical performance, reducing the complexity of encoding geometric configurations.
  • By embedding rotational symmetry in the SAT encoding, the method enhances human interpretability and solution aesthetics.
  • The study presents a minimal odd-sized solution with 21 points for the everywhere-unbalanced-points problem, improving upon previous configurations.

Abstract

We present a computational methodology for obtaining rotationally symmetric sets of points satisfying discrete geometric constraints, and demonstrate its applicability by discovering new solutions to some well-known problems in combinatorial geometry. Our approach takes the usage of SAT solvers in discrete geometry further by directly embedding rotational symmetry into the combinatorial encoding of geometric configurations. Then, to realize concrete point sets corresponding to abstract designs provided by a SAT solver, we introduce a novel local-search realizability solver, which shows excellent practical performance despite the intrinsic R-completeness of the problem. Leveraging this combined approach, we provide symmetric extremal solutions to the Erdos-Szekeres problem, as well as a minimal odd-sized solution with 21 points for the everywhere-unbalanced-points problem, improving on the previously known 23-point configuration. The imposed symmetries yield more aesthetically appealing solutions, enhancing human interpretability, and simultaneously offer computational benefits by significantly reducing the number of variables required to encode discrete geometric problems.

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Cite This Study

Subercaseaux et al. (2025) studied this question.

synapsesocial.com/papers/68e6bc5f38ca8e474d549fc3https://doi.org/10.48550/arxiv.2506.00224
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