J. M. Rassias Product-sum Stability of an Euler-lagrange Functional Equation
نویسنده
چکیده
In 1940 (and 1964) S. M. Ulam proposed the well-known Ulam stability problem. In 1941 D. H. Hyers solved the Hyers-Ulam problem for linear mappings. In 1992 and 2008, J. M. Rassias introduced the Euler-Lagrange quadratic mappings and the JMRassias “product-sum” stability, respectively. In this paper we introduce an Euler-Lagrange type quadratic functional equation and investigate the JMRassias “product-sum” stability of this equation. The stability results have applications in Mathematical Statistics, Stochastic Analysis and Psychology.
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