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Ulam Stability Generalizations of 4<sup>th</sup>- Order Ternary Derivations Associated to a Jmrassias Quartic Functional Equation on Fréchet Algebras
Let A be a Banach ternary algebra over a scalar field R or C and X be a ternary Banach A-module.A quartic mapping D :In this paper, we prove Ulam stability generalizations of 4 th -order ternary derivations associated to the following JMRassias quartic functional equation on fréchet algebras: