A Fixed Point Approach to the Stability of the Cauchy Additive and Quadratic Type Functional Equation

[摘要] We investigate the stability of the functional equation2f(x+y)+f(x-y)+f(y-x)-3f(x)-f(-x)-3f(y)-f(-y)=0by using the fixed point theory in the sense ofCădariu andRadu.

[学科分类] 应用数学