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arxiv: 0903.1160 · v1 · submitted 2009-03-06 · 🧮 math.FA

Quadratic--quartic functional equations in RN--spaces

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keywords functionalarbitraryequationequationsfollowinggeneralnormednorms
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In this paper, we obtain the general solution and the stability result for the following functional equation in random normed spaces (in the sense of Sherstnev) under arbitrary $t$-norms $$f(2x+y)+f(2x-y)=4[f(x+y)+f(x-y)]+2[f(2x)-4f(x)]-6f(y).$$

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