A FIXED POINT APPROACH TO THE STABILITY OF THE QUADRATIC AND CUBIC TYPE FUNCTIONAL EQUATION

In this paper, I investigate the stability of the functional equation f (x + 2y) − 3f (x + y) + 3f (x) − f (x − y) − 3f (y) + 3f (−y) = 0 by using the fixed point theory in the sense of L. Cādariu and V. Radu.

1. Introduction

2. Main results

3. Applications

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