Not evaluated
Thompson's group F is nonamenable (family 248)
The gist
On October 6, 2026, OpenAI announced a manuscript whose title states that Thompson's group F is nonamenable.
DiscoverIA status on October 12, 2026: not evaluated, meaning no third-party evaluation found.
AI draft, not reviewedWhat has not been reviewed?
Text written by an AI (DiscoverIA pipeline), on . The status and its sources come from the registry; only the explanatory text has not been reviewed. A reported error is corrected, then the text is reviewed.
Cite this entry
A single status snapshot since Oct 12, 2026: a citation always points to a dated snapshot.
Cite snapshot 1, Oct 12, 2026
APA citation with the dated link
BibTeX @misc, key discoveria-oai-fam-248-thompsons-group-f-nonamenable-r1
@misc{discoveria-oai-fam-248-thompsons-group-f-nonamenable-r1,
author = {{DiscoverIA}},
title = {Thompson's group F is nonamenable (family 248)},
howpublished = {DiscoverIA registry, entry oai-fam-248-thompsons-group-f-nonamenable},
note = {Status “Not evaluated”, snapshot 1, recorded on October 12, 2026. New result},
year = {2026},
url = {https://discoveria.ai/entry/oai-fam-248-thompsons-group-f-nonamenable#releve-1},
urldate = {2026-10-12}
}Dated link opens this snapshot in the history
To understand ≈ 20 s reading time, estimated
What it changes
A group is amenable when each part of the group can be given a size between 0 and 1, the whole group having size 1. This assignment must be additive for a finite number of disjoint parts and unchanged by translation. If the result held, F would admit no such assignment.
What remains unclear
The Lean (a language in which a computer checks every step of a proof) is supplied by OpenAI alone, and formalization.yaml marks it “unchecked”. No third-party evaluation is read in the sources.
For experts
Sources, method, key facts, status history, report an error
Status
Not evaluated
Recorded on · github.com · 248.md
Step 1 of 4 on the scale: not evaluated. Next step: under review.
- Announced
- Recordednot evaluated
- nextTo follow
What this status means
Source reading : Source read word for word (level 3 of 3)
The result is declared neither right nor wrong.
To move to “Under review”: a public review under way. To “Peer reviewed”: a journal publication or a review by named experts.
Sources
- Main sourcegithub.com · CONTENTS.mdlink only, reading not recorded
- Repositorygithub.com · Thompsons-group-F-is…link only, reading not recorded
- Lean proofgithub.com · 248.mdpage read word for word
- Lean proofgithub.com · ThompsonNonamenability.lea…link only, reading not recorded
Method
One manuscript, “Thompson's group F is nonamenable”, dated September 23, 2026. Lean supplied by OpenAI: 1 Comparator statement (ThompsonNonamenability.lean), described in lean/docs/248.md; family present in the “sources” of formalization.yaml. DiscoverIA status: not evaluated, meaning that no third-party evaluation has been found in the sources read. Set on October 12, 2026 from github.com (page read, quotation checked word for word: “describes the scope of the Lean formalization”).
Limits
No named third party: the recorded checks come from the claimant or from a platform tool. The claimant supplies a Lean proof; as of this date, DiscoverIA has found no independent verification of this proof or of the result.
Key facts
- Claimed by
- OpenAI (unreleased internal model)
announced on Oct 6, 2026 - Nature
- new result
- Field
- Mathematics (Group theory)
- In openai/math
- family 248, section “Group theory”, 1 manuscript dated Sep 23, 2026
- Lean proof
- supplied by the claimant, marked “unchecked” (not reviewed) in its repository
- Revisions
- none reported by the claimant
- Checked by
- claimant (Lean supplied, not checked by a third party)
- Sources
- 4 : 1 read word for word, 3 links only
- This entry
- AI draft, not reviewed
Status history
Only one observation so far.
- 01
First observation:Not evaluatedCurrent status
Family with a Lean proof supplied by the claimant. No third-party check read; the source marks this proof as not reviewed (“unchecked”).
Source: github.comread word for word
An observation is added; none is ever erased.
In the same set
openai/math: 719 manuscripts in 372 families from an unreleased internal model · entry 242 of 372, by family number
- Not evaluated : The β-Barendregt–Geuvers–Klop conjecture (family 245)
- Not evaluated : Cannon's conjecture (family 246)
- Not evaluated : An infinite finitely presented residually finite 2-group (family 247)
- Not evaluated : Thompson's group F is nonamenable (family 248)
- Not evaluated : A finitely generated counterexample to Eilenberg–Ganea (family 249)
- Not evaluated : The Boone–Higman conjecture and higher finiteness (family 250)
- Not evaluated : Amenability, unitarizability, and Ulam stability (family 251)
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