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open-problem

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A finite algebraic covering system for the Erdos-Straus conjecture, verified to 10^11 (max A = 359); exploratory search to 1.2x10^12 finds A = 479. Gateway decompositions via divisors of N^2.

  • Updated Aug 1, 2026
  • Python

Computational search for the [22,6,13]₄ linear code over GF(4) — a 25-year open problem in coding theory. Record excess E*=1. 441+ programs, 2.5B+ evaluations, 8 structural theorems including the Freedom Theorem, the Distance Theorem, and the Residual Reduction to [9,5,4]₄. Proyecto Estrella, Madrid.

  • Updated Jun 21, 2026
  • C++

Miura-ori origami flip graphs: candidate general diameter proof using convex order, majorization, and discrete Lipschitz functions, with reproducible verification.

  • Updated Aug 28, 2026
  • TeX

The square achievement game on an n x n grid is a first-player win for every n >= 5. Solvers, logs and verification for the nine previously open cases n = 6..14.

  • Updated Aug 29, 2026
  • C

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