8 citations · 36 across the 18 of their papers we have counts for
4 papers · 2 filters
Normal Hopf subalgebras, depth two and Galois extensions
Lars Kadison
Let be the left -bialgebroid of a depth two extension with centralizer as defined in math.QA/0108067. We show that the left endomorphism ring of depth two extension, not…
Hopf algebroids and Galois extensions
Lars Kadison
To a finite Hopf-Galois extension we associate dual bialgebroids $S := \End_BA_B$ and over the centralizer using the depth two theory in math.RA/0108…
An action-free characterization of weak Hopf-Galois extensions
Lars Kadison
We define comodule algebras and Galois extensions for actions of bialgebroids. Using just module conditions we characterize the Frobenius extensions that are Galois as depth two an…
An approach to quasi-Hopf algebras via Frobenius coordinates
Lars Kadison
We study quasi-Hopf algebras and their subobjects over certain commutative rings from the point of view of Frobenius algebras. We introduce a type of Radford formula involving an a…