A Correspondence between Hopf Ideals and Sub-Hopf Algebras.
On the Structure of Commutative Affine Group Schemes over a Non-Perfect Field.
Survey on matched pairs of groups-an elementary approach to the ESS-LYZ theory
The theory of matched pairs of groups is surveyed with special interest in applications to braided groups and quasitriangular structures on the bi-smash product Hopf algebra.
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