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math.QA2004
Lazy cohomology: an analogue of the Schur multiplier for arbitrary Hopf algebras
Julien Bichon, Giovanna Carnovale
We propose a detailed systematic study of a group H^2_L(A) associated, by elementary means of lazy 2-cocycles, to any Hopf algebra A. This group was introduced by Schauenburg (with…
math.QA2004
Galois and biGalois objects over monomial non semisimple Hopf algebras
Julien Bichon
We describe the Galois objects and biGalois groups of monomial nonsemisimple Hopf algebras. The main feature of our description is the use of modified versions of the second cohomo…