# Contents

## Idea

The Adams e-invariant (Adams 66, section 7) is a collection of group homomorphisms from the stable homotopy groups of spheres to cyclic groups of certain order. Its kernel characterizes the coimage of the J-homomorphism.

## References

The definition is due to section 7 of

• John Adams, On the groups $J(X)$ IV, Topology 5: 21,(1966) Correction, Topology 7 (3): 331 (1968) (pdf)

Reviews include

• Hiroaki Hamanaka, Adams $e$-invariant, Toda bracket and $[X, U(n)]$, J. Math. Kyoto Univ. Volume 43, Number 4 (2003), 815-827. (Euclid)

Last revised on November 17, 2013 at 23:14:14. See the history of this page for a list of all contributions to it.