Results 71 to 80 of about 419 (187)

Synthesis of MoS2/WS2 Nanoflower Heterostructures for Hydrogen Evolution Reaction

open access: yesInternational Journal of Energy Research, Volume 2024, Issue 1, 2024.
Over the last decades, the transition metal dichalcogenide (TMD) materials have been intensively investigated for hydrogen evolution reaction (HER). Among many TMD catalysts, MoS2 and WS2 are the most efficient materials for HER application because of their advantages including earth abundance, facile synthesis, and high catalytic activities. Herein, a
Tuan Van Nguyen   +8 more
wiley   +1 more source

Stability and Superstability of Generalized (, )-Derivations in Non-Archimedean Algebras: Fixed Point Theorem via the Additive Cauchy Functional Equation [PDF]

open access: yes, 2011
Let be an algebra, and let , be ring automorphisms of . An additive mapping ∶→ is called a (,)-derivation if ()=()()+()() for all ,∈. Moreover, an additive mapping ∶→ is said to be a generalized (,)-derivation if there exists a (,)-derivation ∶→ such ...
M. Eshaghi Gordji   +3 more
core   +1 more source

Two general theorems on superstability of functional equations

open access: yes, 2015
We prove that the superstability of some functional equations (e.g., of Cauchy, d’Alembert, Wilson, Reynolds, and homogeneity) is a consequences of two simple theorems.
Xu, Bing   +2 more
core  

Approximately Ternary Homomorphisms and Derivations on C∗-Ternary Algebras

open access: yesAbstract and Applied Analysis, 2012
We investigate the stability and superstability of ternary homomorphisms between C*-ternary algebras and derivations on C*-ternary algebras, associated with the following functional equation f((x2-x1)/3)+f((x1-3x3)/3)+f((3x1+3x3-x2)/3)=f(x1).
M. Eshaghi Gordji   +4 more
doaj   +1 more source

FORKING AND SUPERSTABILITY IN TAME AECS [PDF]

open access: yesThe Journal of Symbolic Logic, 2016
AbstractWe prove that any tame abstract elementary class categorical in a suitable cardinal has an eventually global good frame: a forking-like notion defined on all types of single elements. This gives the first known general construction of a good frame in ZFC.
openaire   +3 more sources

On the superstability of generalized d'Alembert harmonic functions

open access: yes, 2016
The aim of this paper is to study the superstability problem of the d'Alembert type functional equation f(x+y+z)+f(x+y+σ(z))+f(x+σ(y)+z)+f(σ(x)+y+z)=4f(x)f(y)f(z) for all x,y,z ∈ G, where G is an abelian group and σ: G → G is an endomorphism such that ...
Iz-iddine EL-Fassi, EL-Fassi, Iz-iddine
core   +1 more source

On Stability of a Functional Equation Connected with the Reynolds Operator

open access: yesJournal of Inequalities and Applications, 2007
Let (X,∘) be an Abelain semigroup, g:X→X, and let K be either ℝ or ℂ. We prove superstability of the functional equation f(x∘g(y))=f(x)f(y) in the class of functions f:X→K.
Adam Najdecki
doaj   +1 more source

Superstability of approximate cosine type functions on the monoid ℝ² [PDF]

open access: yes, 2012
In this paper, we study the superstability problem for the cosine type functional equation f(x₁x₂, x₁y₂ + x₂y₁) + f(x₁x₂, y₁x₂ ‒ x₁y₂) = 2 f(x₁, y₁) f(x₂, y₂) on the commutative monoid (ℝ²,X).
Bouikhalene, B.   +4 more
core  

Superstability in abstract elementary classes

open access: yes, 2018
We prove that several definitions of superstability in abstract elementary classes (AECs) are equivalent under the assumption that the class is stable, tame, has amalgamation, joint embedding, and arbitrarily large models.
Rami Grossberg (3892297)   +1 more
core   +1 more source

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