Wyniki wyszukiwania - BazTech

Ograniczanie wyników

5 Demonstratio Mathematica

Powiadomienia systemowe

Sesja wygasła!
Sesja wygasła!
Sesja wygasła!
Sesja wygasła!

Znaleziono wyników: 5

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: commuting map

Sortuj według:

Ogranicz wyniki do:

On (α, β)-derivations of semiprime rings, II

Chaudhry M., Thaheem A.

Demonstratio Mathematica

2004

Vol. 37, nr 4

793--802

Centralizing mappings and derivations on semiprime rings

Chaudhry M., Thaheem A.

Demonstratio Mathematica

2004

Vol. 37, nr 2

285--292

In this paper we study some properties of centralizing mappings on semi-prime rings. The main purpose is to prove the result: Let -R be a semiprime ring and f an endomorphism of R, g an epimorphism of R such that the mapping x -> [f(x),g(x)] is central. Then [f(x),g(x)] = 0 holds for all x e R. We also establish some results about (alpha,beta)-derivations.

Coincidence points and R-subweakly commuting multivalued maps

Shahzad N.

Demonstratio Mathematica

2003

Vol. 36, nr 2

427--431

The notion of R-subweakly commuting multivalued mappings is defined. Some coincidence point theorems for such mappings are proved. Thus several related results in the literature are extended to a new class of noncommuting mappings.

Some results on common fixed points and best approximation in p-normed spaces

Khan L., Latif A.

Demonstratio Mathematica

2001

Vol. 34, nr 4

831-836

A general common fixed point result is obtained for commuting maps in p-normed spaces. The Brosowski-Meinardus type approximation theorem in p-normed spaces via our main result is derived. These results unify and include the recent work of Jungck and Sessa [6], Khan and Khan [7], Sahab, Khan and Sessa [II], Singh [12] etc.

A note on (alpha)-derivations on semiprime rings

Thaheem A., Samman M.

Demonstratio Mathematica

2001

Vol. 34, nr 4

783-788

In this note we investigate some properties of a-derivations on prime and semiprime rings. We establish some identities for a commuting a-derivation d on a semiprime ring R and show that d maps R into its center and obtain some well-known results as a consequence. We also generalize Posner's theorem on the composition of derivations for a-derivations and as an application resolve a functional equation of automorphisms on certain prime rings.