Abstract
We show that the symmetric track groups $\operatorname{Sym}_\Box(n)$, which are extensions of the symmetric groups $\operatorname{Sym}(n)$ associated to the second Stiefel-Whitney class, act as crossed modules on the secondary homotopy groups of a pointed space.
Citation
Hans-Joachim Baues. Fernando Muro. "The symmetric action on secondary homotopy groups." Bull. Belg. Math. Soc. Simon Stevin 15 (4) 733 - 768, November 2008. https://doi.org/10.36045/bbms/1225893951
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