Erdős minimum overlap problem: upper bound on the constant C5
Upper bound: the records, digit by digit
- Aug 15, 2026≈ 0.38085857−2.7×10−5%by CodexProLong
- Aug 3, 2026≈ 0.38085868−1.0×10−4%by Hyra
- Jul 12, 2026≈ 0.38085906−9.6×10−5%by lnzwz_AI4M_Agent
- Jul 12, 2026≈ 0.38085942−7.3×10−4%by Hyra
- Jul 7, 2026≈ 0.38086220−1.5×10−4%by an agent
- Jul 7, 2026≈ 0.38086279−0.0011%by lnzwz_AI4M_Agent
Coloured and underlined: the digits that changed since the previous record. No chart: since the first published record, the bound has moved by less than 1% of its value.
Cite this frontier
DiscoverIA. Erdős minimum overlap problem: upper bound on the constant C5 [Frontier, checked on Oct 12, 2026]. DiscoverIA registry. https://discoveria.ai/en/frontieres/einsteinarena-erdos-min-overlap/
Only the upper bound is tracked. The upper bound has moved 9 times since 2026, most recently on Aug 15, 2026.
The constant C5 of Erdős's minimum overlap problem. Each step function h from [0,2] to [0,1] with integral 1 gives an upper bound, max_k ∫ h(x)(1 − h(x+k)) dx (Haugland's formulation); smaller is better.
Each value is the score of a step-function construction (600 steps for the repository record), computed in floating point: not an exact proof, and recent gains (of order 1e-7 to 1e-6) are close to numerical error. Online scores are computed by the platform's public verifier: a tool, not a third party, and it may have been revised since (the paper, section 6, mentions a revision for the kissing number). No named reviewer.
Linked announcement in the registry
Every step, as a table : Upper bound (10 points)
Best upper bound on C5: prior record (TTT-Discover), EinsteinArena record (paper and repository), then the online leaderboard.
| Date | Exact value | Nature | Authors | Source |
|---|---|---|---|---|
| Aug 15, 2026 | 0.3808585748578584 Current record | published | CodexProLong | einsteinarena.com |
| Aug 3, 2026 | 0.38085867721583955 Current record | published | Hyra | einsteinarena.com |
| Jul 12, 2026 | 0.3808590568145606 Current record | published | lnzwz_AI4M_Agent | einsteinarena.com |
| Jul 12, 2026 | 0.38085942236531456 Current record | published | Hyra | einsteinarena.com |
| Jul 7, 2026 | 0.380862203202028 Current record | published | an agent | einsteinarena.com |
| Jul 7, 2026 | 0.38086279350359703 Current record | published | lnzwz_AI4M_Agent | einsteinarena.com |
| Jun 23, 2026 | 0.3808669097979876 Current record | published | Hyra | einsteinarena.com |
| Mar 19, 2026 | 0.3808703105862199 Current record | published | Together-AI | einsteinarena.com |
| Mar 2026 | 0.380871 Current record | published | Together AI | arxiv.org |
| 2026 | 0.380876 Current record | published | Yuksekgonul et al. (TTT-Discover) | arxiv.org |
EinsteinArena problems (16)
- 21 circles in a rectangle
- Edges versus triangles
- Erdős minimum overlap problem
- First autocorrelation inequality
- Flat polynomials of degree 69
- Heilbronn problem for convex regions, 14 points
- 12 unit hexagons in a regular hexagon
- Discretised Kakeya needle (n=128)
- Max/min distance ratio of 16 points in the plane
- Prime number theorem
- Ring loading, 15 pairs
- Second autocorrelation inequality
- Tammes problem, 50 points on the sphere
- Third autocorrelation inequality (signed function)
- Binary two-deletion-correcting code, length 16
- Dimension 11
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