%0 Journal Article
%T Quartic exercises
%A Max-Albert Knus
%A Jean-Pierre Tignol
%J International Journal of Mathematics and Mathematical Sciences
%D 2003
%I Hindawi Publishing Corporation
%R 10.1155/s0161171203203458
%X A correspondence between quartic étale algebras over a field and quadratic étale extensions of cubic étale algebras is set up and investigated. The basic constructions are laid out in general for sets with a profinite group action and for torsors, and translated in terms of étale algebras and Galois algebras. A parametrization of cyclic quartic algebras is given.
%U http://www.hindawi.com/journals/ijmms/2003/284672/abs/