nLab k-invariant

Redirected from "Postnikov invariants".
Contents

Context

Cohomology

cohomology

Special and general types

Special notions

Variants

Extra structure

Operations

Theorems

Contents

1. Idea

The characteristic classes that classify the stages of a Postnikov tower (or dually: Whitehead tower) are called Postnikov invariants or k-invariants.

2. Examples

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3. References

  • Emery Thomas, Postnikov invariants and higher order cohomology operations (JSTOR)

Of H-spaces:

  • Arlettaz, Pointet-Tischler, Postnikov invariants of H-spaces (pdf)

Last revised on January 15, 2013 at 12:57:29. See the history of this page for a list of all contributions to it.