@article { ,
title = {Integral Hopf-Galois structures for tame extensions},
abstract = {We study the Hopf-Galois module structure of algebraic integers in some Galois extensions of p-adic fields L/K which are at most tamely ramified, generalizing some of the results of the author's 2011 paper cited below. If G=Gal(L/K) and H=L[N]G is a Hopf algebra giving a Hopf-Galois structure on L/K, we give a criterion for the OK-order OL[N]G to be a Hopf order in H. When OL[N]G is Hopf, we show that it coincides with the associated order AH of OL in H and that OL is free over AH, and we give a criterion for a Hopf-Galois structure to exist at integral level. As an illustration of these results, we determine the commutative Hopf-Galois module structure of the algebraic integers in tame Galois extensions of degree qr, where q and r are distinct primes.},
issn = {1076-9803},
journal = {New York Journal of Mathematics},
pages = {647-655},
publicationstatus = {Published},
keyword = {QA Mathematics, Hopf-Galois structures, Hopf-Galois module theory, Hopf order, tame ramification},
year = {2013},
author = {Truman, Paul}
}