134 citations
- University of BucharestRO4 papers
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Showing math.RAShow all
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math.RA2009
On the subgroup structure of the full Brauer group of Sweedler Hopf algebra
Giovanna Carnovale, Juan Cuadra
We introduce a family of three parameters 2-dimensional algebras representing elements in the Brauer group BQ(k,H_4) of Sweedler Hopf algebra H_4 over a field k. They allow us to d…
math.RA2008
Generator coalgebras are not necessarily quasi-coFrobenius
Mariana Haim, Blas Torrecillas
We study the problem of whether a coalgebra that generates its category of left (right) comodules is left (right) quasi-coFrobenius or not. We prove it does not hold in general, by…
math.RA2005
Galois Corings and a Jacobson-Bourbaki type Correspondence
J. Cuadra, J. Gomez-Torrecillas
The Jacobson-Bourbaki Theorem for division rings was formulated in terms of corings by Sweedler in 1975. Finiteness conditions hypotheses are not required in this new approach. In…