Counterexamples to weak chromatic splitting: sphere kernels and descent exponents

OpenAI

For the derived p-completed sphere X, the canonical map L_{n−1}X→L_{n−1}L_{K(n)}X is claimed to have no homotopy retraction at n=p for primes p≥5 and at n=p+1 for primes p≥7. The proposed kernel is the image of β₁^((p−1)²); at p=5 it lies in π₆₀₈L₄X.

Sources for this record

What was already known

The weak chromatic-splitting conjecture predicted a retraction for completions of finite spectra. Earlier failures of a stronger summand formula at height two did not refute this weak form.

AI involvement AI-led

OpenAI credits an internal model with the higher-height sphere-kernel and descent-exponent arguments.

OpenAI is the manuscript author and the release attributes its mathematical results to an internal model; individual autonomy is unproven.

Importance Notable

The sphere gives counterexamples to the weak retraction prediction in two higher-height families.

Limitations

Neither the localized kernel argument nor an alternate descent-exponent route has a documented completed check. Strong-splitting and filtration claims in companion papers are distinct.

Technical verification Reported

The manuscript gives proof arguments and an independent descent-exponent route, but no completed human or machine check of either route is documented. Reported is the evidence default and does not imply a failed check.

Human understanding Few

No named person explains the central localized sphere-kernel or descent-exponent mechanism; Few is the evidence default.

Correction and publication history

2026-10-18 · publication

If correct, the sphere gives counterexamples to the weak retraction prediction in two higher-height families.

Read this published revision