Results 321 to 330 of about 70,449 (343)

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
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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
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A characterization of BMO in terms of endpoint bounds for commutators of singular integrals

Israel Journal of Mathematics, 2018
We provide a characterization of BMO in terms of endpoint boundedness of commutators of singular integrals. In particular, in one dimension, we show that ∥b∥BMO ≃ B, where B is the best constant in the endpoint L log L modular estimate for the commutator
Natalia Accomazzo
semanticscholar   +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.
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Commutators of Cauchy-Szego type integrals for domains in C^n with minimal smoothness

, 2021
X. Duong, M. Lacey, Ji Li, B. Wick, Qingyan Wu   +4 more
semanticscholar   +1 more source

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.
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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

Sobolev regularity for commutators of the fractional maximal functions

Banach Journal of Mathematical Analysis, 2020
Feng Liu, Shuai Xi
semanticscholar   +1 more source

On the compactness of commutators of Hardy operators

, 2020
S. Shi, Zunwei Fu, Shan-zhen Lu
semanticscholar   +1 more source

Wasteful Commuting

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