In this work, an alternative fashion of the multi-Jensen is introduced. The structures of the
multi-Jensen and the multi-Euler-Lagrange-Jensen mappings are described. In other words …

In this article, by using a new form of multi-quadratic mapping, we define multi-m-Jensen-
quadratic mappings and then unify the system of functional equations defining a multi-m …

In this paper, we study the general solution of the functional equation, which is derived from
additive–quartic mappings. In addition, we establish the generalized Hyers–Ulam stability of …