Mathematics - Research News

The Tychonoff theorem and invariant pseudodistances

 Mathematics - Research News
 19 April 2019
Tadeusz Kuczumow, Stanisław Prus. Source: Annals of Functional Analysis, Volume 10, Number 2, 284--290.Abstract: In this article we introduce a method of constructing functions with claimed properties by using the Tychonoff theorem. As an application of this method we show that the Carathéodory...

On the equivalence of some concepts in the theory of Banach algebras

 Mathematics - Research News
 19 April 2019
Józef Banaś, Leszek Olszowy. Source: Annals of Functional Analysis, Volume 10, Number 2, 277--283.Abstract: Our principal aim in this article is to show the equivalence of two concepts used recently in the theory of Banach algebras. The result we present here solves an open problem raised by...

Refining and reversing the Fenchel inequality in convex analysis

 Mathematics - Research News
 19 April 2019
Mustapha Raïssouli. Source: Annals of Functional Analysis, Volume 10, Number 2, 252--261.Abstract: Our main goal in this article is to give some functional inequalities involving a (convex) functional and its Fenchel conjugate. As a consequence, we obtain some refinements of the so-called Fenchel...

The structure of 2-local Lie derivations on von Neumann algebras

 Mathematics - Research News
 19 April 2019
Bing Yang, Xiaochun Fang. Source: Annals of Functional Analysis, Volume 10, Number 2, 242--251.Abstract: In this article we characterize the form of each 2-local Lie derivation on a von Neumann algebra without central summands of type ${I_{1}}$ . We deduce that every 2-local Lie derivation...

Pages