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In this paper we describe the Mathematica package FSolve.m for solving an important set of functional equations (as Cauchy, Jensen, Pexider, Sincov, D'Alembert, bisymmetry, etc.). Given a functional equation, its domain of definition and its class of admissible functions, this package uses the Mathematica's symbolic computation capabilities to obtain its general solution. The package allows particular and candidate solutions of the functional equation to be obtained by performing a careful analysis of the involved domains and classes of functions. Finally, when the functional equation cannot be solved, the package checks for restrictions of the domain and/or extensions of the class in order to give the user some type of solution.
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