Uebr die Convergenz einer aus Primzahlpotenzen gebildeten unendlichen Reihe
Un modèle de filtres pour l'analyse réelle synthétique
Unbounded multipliers and summation of series
Unconditional Toeplitz Sections in Sequence Spaces.
Une généralisation du développement en fraction continue
Uniform convergence of power series expansions on the boundary.
Uniform Toeplitz matrices.
Universelle Approximation durch Riesz-Transformierte der geometrischen Reihe.
Vacca-type series for values of the generalized Euler constant function and its derivative.
Variants of Karamata's Iteration Theorem
Vector series whose lacunary subseries converge
The area of research of this paper goes back to a 1930 result of H. Auerbach showing that a scalar series is (absolutely) convergent if all its zero-density subseries converge. A series in a topological vector space X is called ℒ-convergent if each of its lacunary subseries (i.e. those with ) converges. The space X is said to have the Lacunary Convergence Property, or LCP, if every ℒ-convergent series in X is convergent; in fact, it is then subseries convergent. The Zero-Density Convergence...
Vector valued paranormed statistically convergent double sequence spaces
Vector-valued sequence space and its properties
In this paper, a vector topology is introduced in the vector-valued sequence space and convergence of sequences and sequentially compact sets in are characterized.
Vector-valued sequence spaces generated by infinite matrices.
Vergleich ..-beschränkter Wirkfelder mit Hilfe von Quotientendarstellungen.
Weak compactness and summability
Weighted means in non-archimedean fields
Weighted Versions of Beurling's Tauberian Theorem.
What should be a rate of convergence ?
When does the Katětov order imply that one ideal extends the other?
We consider the Katětov order between ideals of subsets of natural numbers ("") and its stronger variant-containing an isomorphic ideal ("⊑ "). In particular, we are interested in ideals for which for every ideal . We find examples of ideals with this property and show how this property can be used to reformulate some problems known from the literature in terms of the Katětov order instead of the order "⊑ " (and vice versa).