Two Möbius groups suffice: Euclidean Ramsey sets on spheres of every dimension, after the tensor classification

Will Strinz

Strinz reports that every finite set of distinct points on a circle is Euclidean Ramsey when all but at most three points have coordinates algebraic over Q. The circle’s center and radius may be arbitrary real numbers.

Sources for this record

What was already known

Earlier work supplied a field criterion and an at-most-six-point result. Pálvölgyi ruled out one non-Ramsey certificate for a wider class without proving this theorem.

AI involvement AI-led

Claude agents developed the proof and Lean port under Will Strinz’s direction. Strinz reviewed the note as owner and chose the release scope; earlier field-criterion results remain separately credited.

Claude generated the central new theorem's proofs and development under Strinz's direction; the precise independence of the initial idea is not documented for this theorem alone.

Importance Notable

The theorem adds an unbounded-size class of planar Ramsey configurations.

Limitations

Reported Lean, Comparator and negative-control checks cover this theorem. A separate Möbius-image extension uses another theorem by hand. No human expert review or explanation of the central certificate is documented, and the novelty search is incomplete.

Technical verification Formal (Lean 4 kernel, NanoDa and con-ron through Comparator; axiom and negative-control checks)

The cited disclosure reports kernel and Comparator checks of the two theorem statements at Lean 4.35.0-rc2, standard-axiom audits, and rejected negative controls. The original rope was also checked at Lean 4.34.1. This covers B(b), not the by-hand Möbius-image combination or the claimed sharpness of three. The reported runs were performed by AI agents; this review did not reproduce them.

Formal checking

Lean 4.35.0-rc2 kernel checking, standard-axiom audit, statement and definition comparison against Challenge.lean, and refusal of five negative controls

Checker
Lean, NanoDa and con-ron kernels through Comparator on a GitHub runner
Scope
Theorem B(b) in OpenAI and Mathlib vocabulary for planar concyclic configurations with at most three nonalgebraic-coordinate points
Basis
Reported by the linked checker

Fresh-runner Comparator at Lean 4.34.1 with ten expected checks; the port compares statements with the originating challenges

Checker
Stock Comparator with Lean kernel on the originating rope AV5
Scope
The same B(b) statements and proofs before the module-system port
Basis
Reported by the linked checker
Evidence source

Checking a formal statement does not establish that it matches the original problem.

Human understanding Few

Default for missing evidence of human explanation: the hand proof and fidelity notes were AI-produced or AI-reviewed, while Strinz's owner review was not line by line. No human expert explanation of the certificate argument is documented.

Correction and publication history

2026-10-18 · publication

A distinct theorem for arbitrarily large concyclic sets with at most three nonalgebraic points.

Read this published revision