Stability of a Fréchet-type functional equation
We establish the generalized Hyers-Ulam stability of the Fréchet-type functional equation \begin{align*} \sum_{\emptyset \neq I \subset \{ 1, 2, \ldots, n+1 \}} (-1)^{|I|-n+1} f \Bigg( \sum_{i \in I} x_i \Bigg) = 0 \end{align*} in the sense of Găvruţa.
math.AP↗