Results 71 to 75 of about 485 (75)

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  

On Baire measurable solutions of some functional equations

Open Mathematics, 2009
Baron Karol
doaj   +1 more source

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