Hopf algebras have been shown to play a natural role in studying questions of integral module structure in extensions of local or global fields. This book surve

Only book on Hopf algebras aimed at advanced undergraduates

This book studies Hopf algebras over valuation rings of local fields and their application to the theory of wildly ramified extensions of local fields. The resu

This study covers comodules, rational modules and bicomodules; cosemisimple, semiperfect and co-Frobenius algebras; bialgebras and Hopf algebras; actions and co