Homology, Homotopy and Applications

Volume 9 (2007)

Number 1

Higher order cohomology operations and minimal atomicity

Pages: 1 – 43

DOI: https://dx.doi.org/10.4310/HHA.2007.v9.n1.a1


Rochelle Pereira (Department of Mathematical Sciences, The College of St. Catherine, St. Paul, Minnesota, U.S.A.)


We prove that $\Omega S^n_{(2)}$, $S^n\{2^r\}$, and $\Omega^2 S^n_{(2)}$ are minimal atomic spaces for appropriate values of $n$. We do this by using secondary and tertiary cohomology operations to prove that, above the Hurewicz dimension, no elements in the mod $2$ homology of the cited spaces are in the image of the Hurewicz homomorphism. In the case of $\Omega^2 S^n$, we construct and exploit an appropriate filtration to facilitate the use of higher order cohomology operations. An appendix consisting of an examination of the coefficients in Adams' factorization is included.


minimal atomic, cohomology operations

2010 Mathematics Subject Classification


Published 1 January 2007