Korean J. Math. Vol. 20 No. 1 (2012) pp.19-31
DOI: https://doi.org/10.11568/kjm.2012.20.1.019

ON THE STABILITY OF THE QUADRATIC-ADDITIVE TYPE FUNCTIONAL EQUATION IN RANDOM NORMED SPACES VIA FIXED POINT METHOD

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Sun Sook Jin
Yang-Hi Lee

Abstract

In this paper, we prove the stability in random normed
spaces via fixed point method for the functional equation
$2f (x + y) + f (x − y) + f (y − x) − f (2x) − f (2y) = 0$



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