Abstract In this paper, we introduce a new quadratic functional equation and, motivated by equation, investigate n -variables mappings which are in each variable. We show that such can be unified as an namely, multi-quadratic equation. also apply fixed point technique to study the stability for equations. Furthermore, present example and few corollaries corresponding hyperstability outcomes.

We prove an existence theorem for a quadratic functional-integral equation of mixed type. The functional-integral equation studied below contains as special cases numerous integral equations encountered in nonlinear analysis. With help of a suitable measure of noncompactness, we show that the functional integral equation of mixed type has solutions being continuous and bounded on the interval [...

and Applied Analysis 3 Clearly, every Menger PN-space is probabilistic metric space having a metrizable uniformity on X if supa<1T a, a 1. Definition 1.3. Let X,Λ, T be a Menger PN-space. i A sequence {xn} in X is said to be convergent to x in X if, for every > 0 and λ > 0, there exists positive integer N such that Λxn−x > 1 − λ whenever n ≥ N. ii A sequence {xn} in X is called Cauchy sequence ...

In this paper, the authors investigate the generalized Ulam-Hyers stability of  n dimensional quadratic functional equation