Hopf Algebras, Polynomial Formal Groups, and Raynaud Orders
Lindsay Childs
Jan 1998 · American Mathematical Society: Memoirs of the American Mathematical Society Book 651 · American Mathematical Soc.
Ebook
118
Pages
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About this ebook
This volume gives two new methods for constructing $p$-elementary Hopf algebra orders over the valuation ring $R$ of a local field $K$ containing the $p$-adic rational numbers. One method constructs Hopf orders using isogenies of commutative degree 2 polynomial formal groups of dimension $n$, and is built on a systematic study of such formal group laws. The other method uses an exponential generalization of a 1992 construction of Greither. Both constructions yield Raynaud orders as iterated extensions of rank $p$ Hopf algebras; the exponential method obtains all Raynaud orders whose invariants satisfy a certain $p$-adic condition.
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