Existency-Closed Groups in X_1 with Special Properties
Existentially closed -groups
Existentially Closed Locally Finite Central Extensions: Multipliers and Local Systems.
Experimenting with infinite groups. I.
Exponents of almost simple groups and an application to the restricted Burnside problem.
Extension and reconstruction theorems for the Urysohn universal metric space
We prove some extension theorems involving uniformly continuous maps of the universal Urysohn space. As an application, we prove reconstruction theorems for certain groups of autohomeomorphisms of this space and of its open subsets.
Extension of complexes of groups
Complexes of groups over ordered simplicial complexes are generalizations to higher dimensions of graphs of groups. We first relate them to complexes of spaces by considering their classifying space . Then we develop their homological algebra aspects. We define the notions of homology and cohomology of a complex of groups with coefficients in a -module and show the existence of free resolutions. We apply those notions to study extensions of complexes of groups with constant or abelian kernel....
Extensions centrales de groupes algébriques simplement connexes et cohomologie galoisienne
Extensions of abelian by hyper-(cyclic or finite) groups (II)
Extensions of group retractions.
Extensions realising a faithful abstract kernel and their automorphisms.
Extraspecial sections of periodic -groups
Extreme elements of finite -groups