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Ordinary differential equations with fractal noise
Authors:F. Klingenhö  fer   M. Zä  hle
Affiliation:Mathematical Institute, University of Jena, D-07740 Jena, Germany ; Mathematical Institute, University of Jena, D-07740 Jena, Germany
Abstract:
The differential equation

begin{displaymath}dx(t) , = , a(x(t),t) ,dZ(t) :+: b(x(t),t) ,dt end{displaymath}

for fractal-type functions begin{math}Z(t) end{math} is determined via fractional calculus. Under appropriate conditions we prove existence and uniqueness of a local solution by means of its representation begin{math}x(t), =, h(y(t)+Z(t),t) end{math} for certain begin{math}C^1 end{math}-functions begin{math}h end{math} and begin{math}y end{math}. The method is also applied to Itô stochastic differential equations and leads to a general pathwise representation. Finally we discuss fractal sample path properties of the solutions.

Keywords:
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