On stochastic differential equations with fuzzy set coefficients

Abstract

We define stochastic differential equations with fuzzy set coefficients and prove that their solutions are random fuzzy set processes. This is achieved by obtaining almost sure boundedness of solutions to stochastic differential equations with set coefficients. An example for Black-Scholes market model with expected return ratio being a fuzzy set is also given. © 2008 Springer-Verlag Berlin Heidelberg.