Volume 19, issue 1 (2019)

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A simplicial James–Hopf map and decompositions of the unstable Adams spectral sequence for suspensions

Fedor Pavutnitskiy and Jie Wu

Algebraic & Geometric Topology 19 (2019) 77–108
Abstract

We use combinatorial group theory methods to extend the definition of the classical James–Hopf invariant to a simplicial group setting. This allows us to realize certain coalgebra idempotents at an sSet level and obtain a functorial decomposition of the spectral sequence, associated with the lower p–central series filtration on a free simplicial group.

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Keywords
James–Hopf invariants, Milnor's construction, unstable Adams spectral sequence, loop space decompositions
Mathematical Subject Classification 2010
Primary: 55P35
Secondary: 18G30, 55T15
References
Publication
Received: 14 March 2017
Revised: 31 July 2018
Accepted: 11 August 2018
Published: 6 February 2019
Authors
Fedor Pavutnitskiy
Department of Mathematics
National University of Singapore
Singapore
Jie Wu
Department of Mathematics
National University of Singapore
Singapore
http://www.math.nus.edu.sg/~matwujie