Hopf Algebras, Polynomial Formal Groups and Raynaud Orders

ISBN-13: 9780821810774 / Angielski / Miękka / 1998 / 118 str.

Lindsay N. Childs; Canada) Quebec Cornelius (Universite Laval Greither

Opis

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.