Stability of Euler-Lagrange type cubic functional equations in quasi-Banach spaces

Wutiphol Sintunavarat, Nguyen Van Dung, Anurak Thanyacharoen

In this paper, we study the generalized Hyers-Ulam stability of Euler-Lagrange type cubic functional equation of the form \begin{align*} 2mf(x + my) + 2f(mx - y) = (m^3 + m)[f(x+ y…