A fixed point approach to the stability of a quadratic-cubic functional equation
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Abstract
In this paper, we investigate the stability of the functional equation
\begin{align*}f (x +ky)&-kf (x + y)+kf (x - y)- f (x-ky)- f (ky)\\
&+\frac{k^3+k^2-2k}2 f ( -y)-\frac{k^3-k^2-2k}2 f ( y)=0
\end{align*}
by using the fixed point theory in the sense of L. C\u adariu and V. Radu.
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References
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