Über die Einlagerung topologischer Gruppen in Kompakte
Über die Funktionalgleichung f(f(x) * f(y)) = f(x*y).
Über die Funktionalgleichung f(f(x)*f(y)) = f(x*y). (Short Communication).
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.
Ultrafilters on a discrete set with two binary operations.
Un exemple de sous-groupe additif de l'espace de Hilbert
Une approche nouvelle de la presque-périodicité faible.
Une topolgie du monoide libre.
Unified semigroups.
Uniform measures on topological groups
Uniform normality of topological groups and -groups
Uniform Semigroups.
Uniform semigroups and fixed point properties.
Uniformly continuous functions on compact semigroups
Unique reducibility of subsets of commutative topological groups and semigroups.
Uniqueness results for the ax+b group and related algebraic objects
Unitary closure and Fourier algebra of a topological group
This is a sequel to our recent work (2012) on the Fourier-Stieltjes algebra B(G) of a topological group G. We introduce the unitary closure G̅ of G and use it to study the Fourier algebra A(G) of G. We also study operator amenability and fixed point property as well as other related geometric properties for A(G).
Unitary dilations of multi-parameter semigroups of operators
Universal connections on Lie groupoids.
Universal mapping properties of semigroup compactifications.