%0 Journal Article
%T On the Stability of Mixed Additive--Quadratic and Additive--Drygas Functional Equations
%J Sahand Communications in Mathematical Analysis
%I University of Maragheh
%Z 2322-5807
%A Najati, Abbas
%A Noori, Batool
%A Moghimi, Mohammad Bagher
%D 2020
%\ 11/01/2020
%V
%N
%P -
%! On the Stability of Mixed Additive--Quadratic and Additive--Drygas Functional Equations
%K Hyers-Ulam stability
%K Additive
%K Quadratic
%K Drygas
%K Functional equation
%K Lebesgue measure zero
%K Pexider equation
%R 10.22130/scma.2020.127585.801
%X In this paper, we have improved some of the results in [C. Choi and B. Lee, Stability of Mixed Additive-Quadratic and Additive--Drygas Functional Equations. Results Math. 75 no. 1 (2020), Paper No. 38]. Indeed, we investigate the Hyers-Ulam stability problem of the following functional equationsbegin{align*} 2varphi(x + y) + varphi(x - y) &= 3varphi(x)+ 3varphi(y) \ 2psi(x + y) + psi(x - y) &= 3psi(x) + 2psi(y) + psi(-y).end{align*}We also consider the Pexider type functional equation [2psi(x + y) + psi(x - y) = f(x) + g(y),] and the additive functional equation[2psi(x + y) + psi(x - y) = 3psi(x) + psi(y).]
%U