2 papers
math.QA2005
Cleft extensions of Hopf algebroids
Gabriella Böhm, Tomasz Brzezinski
The notions of a cleft extension and a cross product with a Hopf algebroid are introduced and studied. In particular it is shown that an extension (with a Hopf algebroid $H= (H_L,H…
math.QA2003
Hopf Algebroid Symmetry of Abstract Frobenius Extensions of Depth 2
Gabriella B"ohm, Korn'el Szlach'anyi
We study Frobenius 1-morphisms in an additive bicategory $\c$ satisfying the depth 2 condition. We show that the 2-endomorphism rings $\c^2(ı\x\ib,ı\x\ib)$ and $\c^2(\ib\xı,\ib…