The geometric case of the Erdős similarity conjecture

OpenAI

For each fixed q∈(0,1) and η∈(0,1), there is a compact set E in [0,1] of measure greater than 1−η containing no translated copy of {qⁿ:n≥1} under any nonzero real dilation of either sign. E may depend on q.

Sources for this record

What was already known

Earlier finite-gap and slow-decay criteria did not cover geometric progressions. A separate OpenAI manuscript established the special ratio q=1/2.

AI involvement AI-led

OpenAI authors the geometric-ratio manuscript and credits its internal model with the release. Kan Jiang and Lifeng Xi later explain and extend the finite-tree construction in their own work.

OpenAI institutional authorship and the release's internal-model production account cover the geometric manuscript, without a session-level basis for AI-autonomous.

Importance Notable

This extends the dyadic case to every fixed geometric ratio, while leaving the general Erdős similarity conjecture open.

Limitations

Patrick White reports computational spot checks of the general-ratio argument, not a complete proof check. The Lean formalization covers only the separate dyadic theorem. Jiang and Xi later proved a stronger variable-ratio result by a separately credited argument.

Technical verification Partial

Patrick White reports computational spot checks of the general-ratio mechanism, while expressly treating the all-q theorem as paper-only. The source-reported Lean formalization and independent replay concern a distinct dyadic manuscript, so they do not count as a machine check of this assessed argument. Jiang and Xi give a stronger new human proof but do not certify the original argument. No complete rigorous check of the October theorem is documented.

Human understanding Full

Jiang and Xi's October 8 human-authored extension explicitly explains the original finite-tree routing, local windows, grid stability, and scale-count mechanism and adapts it to variable ratios. This supports understanding of the central construction, independently of whether they checked every line of OpenAI's proof.

Correction and publication history

2026-10-18 · publication

This extends the dyadic case to every fixed geometric ratio, while leaving the general Erdős similarity conjecture open.

Read this published revision