Building Buildings.
Building semigroups from groups (and reduced semigroups).
Buildings and non-positively curved polygons of finite groups.
Buildings and shadows.
Burnside obstructions to the Montesinos-Nakanishi 3-move conjecture.
Butler groups and lattices of types
Butler groups and Shelah's Singular Compactness
A torsion-free group is a -group if and only if it has an axiom-3 family of decent subgroups such that each member of has such a family, too. Such a family is called -family. Further, a version of Shelah’s Singular Compactness having a rather simple proof is presented. As a consequence, a short proof of a result [R1] stating that a torsion-free group in a prebalanced and TEP exact sequence is a -group provided and are so.
Butler groups cannot be classified by certain invariants
Butler groups of infinite rank
Butler groups of infinite rank and axiom 3
Butler groups splitting over a base element
We characterize a particular kind of decomposition of a Butler group that is the general case for Butler B(1)-groups; and exhibit a decomposition of a B(2)-group which is not of that kind.
Butler groups, valuated vector spaces, and duality
-groups.
algebras associated with von Neumann algebras
Ad un'algebra di von Neumann separabile , in forma standard su di uno spazio di Hilbert , si associa la algebra definita come la algebra costituita dai punti fissi dell'algebra di Cuntz generalizzata mediante l'azione canonica del gruppo degli unitari di . Si dà una caratterizzazione di nel caso in cui è un fattore iniettivo. In seguito, come applicazione della teoria dei sistemi asintoticamente abeliani, si mostra che, se è uno stato vettoriale normale e fedele di , la restrizione...
C. N. Yang a současná matematika
-semipermutable subgroups of finite groups.
Cacti, braids and complex polynomials.
Calcul de la distance par les sous-mots
Calcul du centralisateur d'un groupe de permutations
Calcul sur ordinateur de demi-groupes finis de transformations