Abstract
We give a construction that associates to a pointed topological space $(X,x_0)$ a homotopy invariant $\,_2\kappa^4$ which we call the secondary invariant. This construction can be seen a ``3-type" generalization of the classical $k$-invariant.
Citation
Mihai D. Staic. "Secondary Cohomology and $k$-invariants." Bull. Belg. Math. Soc. Simon Stevin 19 (3) 561 - 572, september 2012. https://doi.org/10.36045/bbms/1347642383
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