منابع مشابه
Finite Covers with Nite Kernels
We are concerned with the following problem. Suppose ? and are closed permutation groups on innnite sets C and W and : ? ?! is a non-split, continuous epimorphism with nite kernel. Describe (for xed) the possibilities for. Here, we consider the case where arises from a nite cover : C ?! W. We give reasonably general conditions on the permutation structure hW; i which allow us to prove that thes...
متن کاملKernels and Cohomology Groups for Some Finite Covers
We extend work of G. Ahlbrandt and M. Ziegler to give a classiication of the nite covers with bre group of prime order p for the projective space over the eld with p elements, and for the Grassmannian of k-sets from a disintegrated set (for k 2 N). AMS classiication: 03C35 and 20B27. This paper is a contribution to the study of the ne detail of the class of (countable) totally categorical struc...
متن کاملFinite p-groups with few non-linear irreducible character kernels
Abstract. In this paper, we classify all of the finite p-groups with at most three non linear irreducible character kernels.
متن کاملFinite polytopes have finite regular covers
We prove that any finite, abstract n-polytope is covered by a finite, abstract regular n-polytope.
متن کاملAlmost-free finite covers
Let W be a first-order structure and ρ be an Aut(W )-congruence on W . In this paper we define the almost-free finite covers of W with respect to ρ, and we show how to construct them. These are a generalization of free finite covers. A consequence of a result of [5] is that any finite cover of W with binding groups all equal to a simple non-abelian permutation group is almostfree with respect t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annals of Pure and Applied Logic
سال: 1997
ISSN: 0168-0072
DOI: 10.1016/s0168-0072(97)00018-3