Some facts about homogeneity properties
Some finitely generated subsemigroups of S(X)
Some monothetic subsemigroups of S(R).
Some theorems concerning semigroup actions on euclidean spaces.
Spaces of homeomorphisms
Specker-Kompaktifizierungen von lokal kompakten topologischen Gruppen.
Spectra of elements in the group ring of SU(2)
We present a new method for establishing the ‘‘gap” property for finitely generated subgroups of , providing an elementary solution of Ruziewicz problem on as well as giving many new examples of finitely generated subgroups of with an explicit gap. The distribution of the eigenvalues of the elements of the group ring in the -th irreducible representation of is also studied. Numerical experiments indicate that for a generic (in measure) element of , the “unfolded” consecutive spacings...
Stability and asymptotic stability in impulsive semidynamical systems.
Stable rank and real rank of compact transformation group C*-algebras
Let (G,X) be a transformation group, where X is a locally compact Hausdorff space and G is a compact group. We investigate the stable rank and the real rank of the transformation group C*-algebra C₀(X)⋊ G. Explicit formulae are given in the case where X and G are second countable and X is locally of finite G-orbit type. As a consequence, we calculate the ranks of the group C*-algebra C*(ℝⁿ ⋊ G), where G is a connected closed subgroup of SO(n) acting on ℝⁿ by rotation.
Sur les deux notions de l'invariant caractéristique
Sur les espaces annelés avec groupe d'opérateurs
Sur les fonctions de pluralité.
Sur les groupes de fonctions
Sweeping Out under a Collection of Transformations.
Symons’ -congruence on sandwich semigroups