Andrew Stacey

Andrew Stacey
Information about my research, teaching, and other interests.

By: Andrew Stacey
Contact details

Andrew Stacey

blosxom icon

Mon, 26th Nov 2007 (Research :: Papers)

The Hunting of the Hopf Ring (PDF or PS)

Joint with Sarah Whitehouse

We provide a new algebraic description of the structure on the set of all unstable cohomology operations for a suitable generalised cohomology theory, E*. Our description is as a graded and completed version of a Tall-Wraith monoid. The E*-cohomology of a space X is a module for this Tall-Wraith monoid. We also show that the corresponding Hopf ring of unstable co-operations is a module for the Tall-Wraith monoid of unstable operations. Further examples are provided by considering operations from one theory to another.

[Full link]
Last modified on:
Mon, 24th Aug 2009