Hopkins's chromatic splitting conjecture

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Work pp-locally. For each n≥1n\geq 1, consider the chromatic fracture square and the map Ln−1X→Ln−1LK(n)XL_{n-1}X\to L_{n-1}L_{K(n)}X. If XX is the pp-completion of a finite spectrum, let γn\gamma_n denote a prospective splitting of this map.

Chromatic splitting conjecture. If XX is the pp-completion of a finite spectrum, then a splitting γn\gamma_n exists for all nn.

The conjecture describes how the chromatic localizations LnS0L_nS^0 assemble through the chromatic tower and is motivated by computations of Morava stabilizer group cohomology and the homotopy groups of LK(n)S0L_{K(n)}S^0. Its resolution is not given in the supplied source.

References

Primary source

Tobias Barthel, “A short introduction to the telescope and chromatic splitting conjectures”, arXiv:1902.05046 (2019).

Additional references

2 papers in this index state this conjecture (2019). The statement above is taken from the most recent of them; the others are arXiv:1901.09004.

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Solutions 1

RemarkAI-assistedClaimed by OpenAI. Claims no homotopy retraction for the canonical weak chromatic-splitting map at height p for primes at least five and at height p+1 for primes at least seven, with nonzero sphere-product kernel classes.See full solutionHide full solution

Claimed by OpenAI. Claims no homotopy retraction for the canonical weak chromatic-splitting map at height p for primes at least five and at height p+1 for primes at least seven, with nonzero sphere-product kernel classes.

Scope relative to this problem: The source claims no homotopy retraction for the canonical weak chromatic-splitting map at height p for primes p>=5 and height p+1 for primes p>=7, with nonzero sphere-product kernel classes. This is a negative instance of the universally quantified weak splitting assertion for the p-completed sphere, keeping the stated heights and prime bounds.

GitHub repository: https://github.com/openai/math

Manuscript: https://github.com/openai/math/blob/adc7f1241b42e322a6451854ab7e4b4c146bf78a/preprints/Counterexamples-to-weak-chromatic-splitting-sphere-kernels-and-descent-exponents-September-27-2026/paper.pdf

  • OpenAI-318-05-Counterexamples-to-weak-chromatic-splitting-sphere-kernels-and-descent-exponents.pdf489,671 bytesOpen