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NumPSLA -- An experimental research tool for pseudoline arrangements and order types

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arxiv 2503.02336 v1 pith:SXMEOSAF submitted 2025-03-04 math.CO cs.CG

classification math.COcs.CG
keywords arrangementsorderpseudolinetypesabstractprogrampseudolinessmall
verification ladder T0 review T1 audit T2 compute T3 formal
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We present a program for enumerating all pseudoline arrangements with a small number of pseudolines and abstract order types of small point sets. This program supports computer experiments with these structures, and it complements the order-type database of Aichholzer, Aurenhammer, and Krasser. This system makes it practical to explore the abstract order types for 12 points, and the pseudoline arrangements of 11 pseudolines.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Enumeration and Classification of Triangle-Maximal Pseudoline Arrangements

    math.CO 2026-07 conditional novelty 7.0 of 10

    Exhaustive enumeration and classification of triangle-maximal pseudoline arrangements for all odd n ≤ 27, with symmetry groups per projective class and existence settled for all odd n ≤ 89 except n = 11.

  2. Sweeping $x$-monotone pseudolines

    cs.CG 2025-07 conditional novelty 7.0 of 10

    Every arrangement of n x-monotone pseudolines admits a sweep with rope length at most 2n-2, and some arrangements require at least 7(n-2)/4+1.

  3. Constructing Optimal Kobon Triangle Arrangements via Table Encoding, SAT Solving, and Heuristic Straightening

    math.CO 2025-07 conditional novelty 6.0 of 10

    New computational constructions claim to achieve the upper bounds for 23 and 27 lines in the Kobon triangle problem, yielding N(23)=161 and N(27)=225, subject to the reliability of a heuristic straightening step.

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