Tracial projection methods and uniform property Gamma

OpenAI

For a simple separable unital infinite-dimensional nuclear stably finite C*-algebra with traces, real rank zero of the uniform tracial ultrapower of its uniform tracial completion implies a central projection halving every specified trace on every coefficient. This yields uniform property Gamma for each specified free ultrafilter.

Sources for this record

What was already known

Earlier real-rank-zero results gave tracial divisibility without central coefficient identities; other uniform-Gamma routes imposed additional hypotheses.

AI involvement AI-led

OpenAI is credited as author of this model-produced result. No individual human checker or explanation of the construction was identified.

The institutional AI authorship and release provenance document central model mathematical work.

Importance Notable

The claimed implication answers Schafhauser–Tikuisis–White Problem XXI in this scope.

Limitations

The Lean endpoint and statement comparison cover the stated central-splitting implication. No named human mathematical review of the proof was identified.

Technical verification Formal (Lean 4 theorem with Comparator statement alignment)

OpenAI reports a Lean proof of the exact real-rank-zero-to-uniform-Gamma statement; Challenge.lean proves that its packaged statement is equivalent to the original formulation. The comparator target's sorry is a challenge placeholder, not the cited proof endpoint.

Formal checking

OAI.ComparatorModel.CurrentMain.main via main_iff_original and OAI.CurrentMain.real_rank_zero_uniform_gamma; ComparatorChallenges/UniformGamma.lean states the target

Checker
Lean 4 development in the OpenAI release
Scope
Real rank zero of B^ω implies a coefficient-halving central projection and uniform Gamma for the stated simple unital nuclear stably finite algebra and fixed free ultrafilter
Basis
Reported by the linked checker
Evidence source

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

Human understanding Few

No named human account explaining the model's central-splitting proof was found; Few is the documentation default.

Correction and publication history

2026-10-18 · publication

The claimed implication answers Schafhauser–Tikuisis–White Problem XXI in this scope.

Read this published revision