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Around conjectures of N. Kuhn

Abstract : We discuss two extensions of results conjectured by Nick Kuhn about the non-realization of unstable algebras as the mod $p$ singular cohomology of a space, for $p$ a prime. The first extends and refines earlier work of the second and fourth authors, using Lannes' mapping space theorem. The second (for the prime $2$) is based on an analysis of the $-1$ and $-2$ columns of the Eilenberg-Moore spectral sequence, and of the associated extension. In both cases, the statements and proofs use the relationship between the categories of unstable modules and functors between $\Fp$-vector spaces. The second result in particular exhibits the power of the functorial approach.
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Preprints, Working Papers, ...
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Contributor : Lionel Schwartz <>
Submitted on : Thursday, February 5, 2015 - 12:45:23 PM
Last modification on : Wednesday, April 28, 2021 - 6:45:39 PM
Long-term archiving on: : Wednesday, May 6, 2015 - 10:16:25 AM


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  • HAL Id : hal-00944820, version 3
  • ARXIV : 1402.2617


Nguyen The Cuong, Gérald Gaudens, Geoffrey Powell, Lionel Schwartz. Around conjectures of N. Kuhn. 2014. ⟨hal-00944820v3⟩



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