nLab
k-invariant

Context

Cohomology

cohomology

Special and general types

Special notions

Variants

Extra structure

Operations

Theorems

Contents

Idea

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

Examples

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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.