Über subdirekte Summen geordneter Gruppen
Über Summen einfach geordneter Gruppen
Über vollständige Automorphismengruppen und Gleichungen in der Modulgruppe
Ueber eine einfache Gruppe von 504 Operationen.
Ultracompanions of subsets of a group
Let be a group, be the Stone-Čech compactification of endowed with the structure of a right topological semigroup and . Given any subset of and , we define the -companion of , and characterize the subsets with finite and discrete ultracompanions.
Un nouvel invariant pour les sphères d'homologie de dimension trois
Un problema sul gruppo degli automorfismi di un -gruppo finito
Una caratterizzazione reticolare dei gruppi completamente fattorizzabili
Undirected and directed graphs with near polynomial growth
The growth function of a graph with respect to a vertex is near polynomial if there exists a polynomial bounding it above for infinitely many positive integers. In the paper vertex-symmetric undirected graphs and vertex-symmetric directed graphs with coinciding in- and out-degrees are described in the case their growth functions are near polynomial.
Une construction du groupe de Fischer
Une famille infinie de formes quadratiques entières; leurs groupes d'automorphismes
Unification for nilpotent groups of class 2.
Uniform growth of groups acting on Cartan–Hadamard spaces
In this paper we investigate the growth of finitely generated groups. We recall the definition of the algebraic entropy of a group and show that if the group is acting as a discrete subgroup of the isometry group of a Cartan–Hadamard manifold with pinched negative curvature then a Tits alternative is true. More precisely the group is either virtually nilpotent or has a uniform growth bounded below by an explicit constant.
Unique -closure for some -groups of rational valued functions
Usually, an abelian -group, even an archimedean -group, has a relatively large infinity of distinct -closures. Here, we find a reasonably large class with unique and perfectly describable -closure, the class of archimedean -groups with weak unit which are “-convex”. ( is the group of rationals.) Any is -convex and its unique -closure is the Alexandroff algebra of functions on defined from the clopen sets; this is sometimes .
Unique covering on radical classes of -groups
Units of the string link monoids
We show that the map obtained by viewing a geometric (i.e. representative) braid as a string link induces an isomorphism of the n-strand braid group onto the group of units of the n-strand string link monoid.
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