New answers tagged hopf-algebras
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Exotic Hopf algebra structures on the $p$-fold direct product in characteristic $p > 0$
$\def\Spec{\text{Spec}}\def\GG{\mathbb{G}}\def\ZZ{\mathbb{Z}}$Yes, there are other Hopf structures. First I'll give a non-local (but connected) example, and then I'll modify it to be local.
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Finiteness of the number of Hopf subalgebras
No. Following discussions with Pavel Etingof and Serge Skryabin, the Nichols' Hopf algebras $ H_{2^n} $ described below, initially introduced in [N78] and further discussed in [EG04, §2.2], present a ...
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