Results 61 to 70 of about 94 (84)

On the Ulam-Hyers stability of a quadratic functional equation

Journal of Inequalities and Applications, 2011
The Ulam-Hyers stability problems of the following quadratic equation r 2 f x + y r + r 2 f x - y r = 2 f ( x ) + 2 f ( y ) , where r is a nonzero rational number, shall be treated.
Park Won-Gil, Bae Jae-Hyeong, Lee Sang-Baek   +2 more
doaj  

Fuzzy stability of a mixed type functional equation

Journal of Inequalities and Applications, 2011
In this paper, we investigate a fuzzy version of stability for the functional equation f ( x + y + z ) - f ( x + y ) - f ( y + z ) - f ( x + z ) + f ( x ) + f ( y ) + f ( z ) = 0 in the sense of Mirmostafaee and Moslehian.
Jin Sun, Lee Yang-Hi
doaj  

Some remarks on the stability of the multi-Jensen equation

Open Mathematics, 2013
Schwaiger Jens
doaj   +1 more source

Commutativity of set-valued cosine families

Open Mathematics, 2014
Smajdor Andrzej, Smajdor Wilhelmina
doaj   +1 more source

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Set-Valued Solutions of an Equation of Jensen Type

Quaestiones Mathematicae, 2023
Dorian Popa, Michael Rassias, Alina Ramona Baias   +2 more
exaly  

On Stability and Nonstability of Systems of Functional Equations

Quaestiones Mathematicae, 2021
Bahman Hayati, Hamid Khodaei, Madjid Eshaghi   +2 more
exaly  

On Some Functional Equations and Their Stability

Journal of Interdisciplinary Mathematics, 2020
Abbas Najati, Prasanna K Sahoo
exaly  

On a Functional Equation Related to Some Entropies in Information Theory

Journal of Discrete Mathematical Sciences and Cryptography, 2018
Dhiraj Kumar Singh, Pranav Dass
exaly  

Cosine Functions Revisited

Banach Journal of Mathematical Analysis, 2011
Dilian Yang
exaly  

Stability of a Jensen Type Functional Equation

Banach Journal of Mathematical Analysis, 2007
Chung Soon-yeong, Young-Su Lee
exaly