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math.AT2014
Morita theory for Hopf algebroids, principal bibundles, and weak equivalences
Laiachi El Kaoutit, Niels Kowalzig
We show that two flat commutative Hopf algebroids are Morita equivalent if and only if they are weakly equivalent and if and only if there exists a principal bibundle connecting th…
math.RA2014
Duality features of left Hopf algebroids
Sophie Chemla, Fabio Gavarini, Niels Kowalzig
We explore special features of the pair (U^*, U_*) formed by the right and left dual over a (left) bialgebroid U in case the bialgebroid is, in particular, a left Hopf algebroid. I…