be a finite-dimensional Hopf algebra over a field k, B a left H-module algebra, and H∗ the dual Hopf algebra of H. For an H∗-Azumaya Galois extension B with center C, it is shown that B is an H∗-DeMeyer-Kanzaki Galois extension if
and only if C is a maximal commutative separable subalgebra of
the smash product B#H. Moreover, the characterization of a commutative Galois algebra as given by S. Ikehata (1981) is generalized.">
让
H是一个有限维霍普夫代数领域
k,
B一个左
H模块代数,
H
∗的双重霍普夫代数
H。对于一个
H
∗-Azumaya伽罗瓦扩张
B与中心
C,它是显示
B是一个
H
∗当且仅当-DeMeyer-Kanzaki伽罗瓦扩展
C是一个最大的交换分离子代数的粉碎产品
B
#
H。此外,交换伽罗瓦代数的特征是由美国Ikehata(1981)是广义的。