Sur l'équation f(x)f(y)f(-x-y) = g(x)g(y)g(-x-y).
The inverse stability of functional equations is considered, i.e. when the function, approximating a solution of the equation, is an approximate solution of this equation.
In the paper two types of stability and of b-stability of functional equations are distinguished.
We consider the stability, the superstability and the inverse stability of the functional equations with squares of Cauchy’s, of Jensen’s and of isometry equations and the stability in Ulam-Hyers sense of the alternation of functional equations and of the equation of isometry.
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