6 citations · 25 across the 24 of their papers we have counts for
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Non-isomorphic Hopf-Galois structures with isomorphic underlying Hopf algebras
Teresa Crespo, Anna Rio, Montserrat Vela
We give a degree 8 separable extension having two non-isomorphic Hopf-Galois structures with isomorphic underlying Hopf algebras.
On the Galois correspondence theorem in separable Hopf Galois theory
Teresa Crespo, Anna Rio, Montserrat Vela
In this paper we present a reformulation of the Galois correspondence theorem of Hopf Galois theory in terms of groups carrying farther the description of Greither and Pareigis. We…
From Galois to Hopf Galois: theory and practice
Teresa Crespo, Anna Rio, Montserrat Vela
Hopf Galois theory expands the classical Galois theory by considering the Galois property in terms of the action of the group algebra k[G] on K/k and then replacing it by the actio…
Picard-Vessiot Extensions of Real Differential Fields
Teresa Crespo, Zbigniew Hajto
For a linear differential equation defined over a formally real differential field K with real closed field of constants k, Crespo, Hajto and van der Put proved that there exists a…