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The Curtis–Wellington spectral sequence through cohomology

Dana Hunter

Algebraic & Geometric Topology 25 (2025) 3315–3340
Abstract

We study stable homotopy groups through unstable methods applied to their representing infinite loop space Q0S0, as pioneered by Curtis and Wellington. Using cohomology instead of homology, we find a width filtration whose subquotients are simple quotients of Dickson algebras, which thus gives a new filtration of stable homotopy groups. We make initial calculations and determine towers in the resulting width spectral sequence. We also make calculations related to the image of J, and prove that the J homomorphism induces a splitting of the indecomposables of the cohomology of Q0S0.

Keywords
stable homotopy groups, infinite loop space, image of $J$
Mathematical Subject Classification
Primary: 55Q40
Secondary: 55P47, 55Q50
References
Publication
Received: 12 October 2022
Revised: 14 June 2023
Accepted: 26 July 2023
Published: 1 October 2025
Authors
Dana Hunter
Department of Mathematics
University of Oregon
Eugene, OR
United States
Department of Mathematics
Kalamazoo College
Kalamazoo, MI
United States
Mathematics Department
Fort Lewis College
Durango, CO
United States

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