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Liebe Mathematica-User, im beigefuegten Problem wird versucht, mit NDSolve eine gewoehnliche Differentialgleichung zu loesen. Ungluecklicherweise tritt die gesuchte Funktion in der Exponentialfunktion auf und in dem Moment, in dem man die Konstante a mit dem unverdaechtigen Wert 0.0124715 als Faktor im Argument der Exponentialfunktioneinfuehrt, antwortet Mathematica mit der Fehlermeldung: NDSolve::ndnum : The right-hand side of the differential equation does not evaluate to a number at Theta == 0 Wirft man die Konstante a wieder heraus, kann Mathematica das Problem anstandslos loesen. Woran liegt das, bzw. wie kann man das Problem umgehen? Mit freundlichen Gruessen, Rudolf Schuch c/o ZIC/I L511 BASF AG 67056 Ludwigshafen Tel.: 0621/6056006 (*********************************************************************** Mathematica-Compatible Notebook This notebook can be used on any computer system with Mathematica 3.0, MathReader 3.0, or any compatible application. 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