Results 231 to 240 of about 29,135 (266)

On Non-Commutative Algebras and Commutativity Conditions

Results in Mathematics, 1990
A theorem of T. Nakayama states that an algebra \(A\) over an \({\mathcal N}\)- ring \(R\) is commutative if \(A\) satisfies the following condition: (N) For each \(x\) in \(A\), there exists \(f(X)\) in \(X^ 2 R[X]\) such that \(x-f(x)\) is central. More generally, W. Streb studied \(R\)-algebras \(A\) satisfying the following condition: (S) For each \
Komatsu, Hiroaki, Tominaga, Hisao
openaire   +2 more sources

On Commutativity and Strong Commutativity-Preserving Maps

Canadian Mathematical Bulletin, 1994
AbstractIf R is a ring and S ⊆ R, a mapping f:R —> R is called strong commutativity- preserving (scp) on S if [x, y] = [f(x),f(y)] for all x,y € S. We investigate commutativity in prime and semiprime rings admitting a derivation or an endomorphism which is scp on a nonzero right ideal.
Bell, Howard E., Daif, Mohamad Nagy
openaire   +1 more source

Commutator equations

International Journal of Algebra and Computation
In this paper, we investigate properties of varieties of algebras described by a novel concept of equation that we call commutator equation. A commutator equation is a relaxation of the standard term equality obtained substituting the equality relation with the commutator relation.
openaire   +2 more sources

Commutator design for commutator fusing

1973 EIC 11th Electrical Insulation Conference, 1973
One of the biggest problems encountered in the production of universal or D.C. electric motors has been the method and practice of joining the armature's coil wires to the commutator. For years most manufactuers either soft soldered or brazed the coil wires to the commutator.
openaire   +1 more source

Commutators and the Commutator Subgroup

The American Mathematical Monthly, 1977
(1977). Commutators and the Commutator Subgroup. The American Mathematical Monthly: Vol. 84, No. 9, pp. 720-722.
openaire   +1 more source

Wasteful Commuting

Journal of Political Economy, 1982
Bruce W. Hamilton, Ailsa Röell
openaire   +1 more source

Revisiting commuting, built environment and happiness: New evidence on a nonlinear relationship

Transportation Research, Part D: Transport and Environment, 2021
Chaoying Yin, Chunfu Shao
exaly  

Commuting and wellbeing: a critical overview of the literature with implications for policy and future research

Transport Reviews, 2020
Kiron Chatterjee, Samuel Chng, Ben Clark
exaly  

Understanding post-pandemic metro commuting ridership by considering the built environment: A quasi-natural experiment in Wuhan, China

Sustainable Cities and Society, 2023
Yi Lu, Yiling Zheng
exaly  

Trends in commuting time of European workers: A cross-country analysis

Transport Policy, 2022
José Alberto Molina, Jorge Velilla
exaly