“…In addition to supremum and infimum operations, in 2015, Agbeko [5] developed nonlinear stability for different combinations of these two operations, and proved it using the core of the direct method presented by Forti [6]. On the other hand, in 2017, Park and Jang [7] introduced ρ-functional equations, and proved the stability of the equations in various spaces.…”
“…In addition to supremum and infimum operations, in 2015, Agbeko [5] developed nonlinear stability for different combinations of these two operations, and proved it using the core of the direct method presented by Forti [6]. On the other hand, in 2017, Park and Jang [7] introduced ρ-functional equations, and proved the stability of the equations in various spaces.…”
“…It also has been generalized to the function case by P. Gȃvruta [2]. For more details on this topic, we also refer to [1,4,6] and references therein.…”
In this paper, we investigate the Ulam stability of the functional equationsand f (x + y, z + w) + f (x + y, z − w) = 2f (x, z) + 2f (x, w) + 2f (y, z) + 2f (y, w) in paranormed spaces.
In this paper, we introduce the
λ
-quadratic functional equation with three variables and obtain its general solution. The main aim of this work is to examine the Ulam-Hyers stability of this functional equation in non-Archimedean Banach space by using direct and fixed point techniques and examine the stability results in non-Archimedean random normed space.
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