%0 Journal Article
%T Unstable operations in ¨¦tale and motivic cohomology
%A Bertrand Guillou
%A Charles Weibel
%J Mathematics
%D 2013
%I arXiv
%X We classify all \'etale cohomology operations on $H_\et^n(-,\muell{i})$, showing that they were all constructed by Epstein. We also construct operations $P^a$ on the mod-$\ell$ motivic cohomology groups $H^{p,q}$, differing from Voevodsky's operations; we use them to classify all motivic cohomology operations on $H^{p,1}$ and $H^{1,q}$ and suggest a general classification.
%U http://arxiv.org/abs/1301.0872v1