Valentina Rossi (Università di Udine) à 16h00


Titre: Galois theory and double central extensions
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Résumé:
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We define a Galois structure between central extensions
and extensions in a Maltsev variety. By using the theory
of commutators we introduce double central extensions.
We then prove that the covering morphisms relative to this
Galois structure are precisely the double central extensions.