#### Volume 6, issue 4 (2006)

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Postnikov extensions of ring spectra

### Daniel Dugger and Brooke Shipley

Algebraic & Geometric Topology 6 (2006) 1785–1829
 arXiv: math.AT/0604260
##### Abstract

We give a functorial construction of $k$–invariants for ring spectra and use these to classify extensions in the Postnikov tower of a ring spectrum.

##### Keywords
ring spectrum, k-invariant, Postnikov extension
Primary: 55P43
Secondary: 55S45