CONTENTS 1. Introduction...........................................................................................................................................5 1.1. The Wong-Zakai theorem and its generalizations.............................................................................5 1.2. Approximation methods for stochastic differential equations.............................................................7 1.3. Extensions of the Wong-Zakai theorem and their applications..........................................................9 2. Approximation theorem of Wong-Zakai type for functional stochastic differential equations................10 2.1. Introductory remarks........................................................................................................................10 2.2. Definitions and notation...................................................................................................................10 2.3. Description of the model..................................................................................................................11 2.4. Approximation theorem....................................................................................................................15 2.5. Examples.........................................................................................................................................24 3. An extension of the Wong-Zakai theorem to stochastic evolution equations in Hilbert spaces............26 3.1. Introductory remarks.......................................................................................................................26 3.2. Definitions and notation..................................................................................................................26 3.3. Description of the model.................................................................................................................27 3.4. The main theorem...........................................................................................................................31 3.5. Examples.........................................................................................................................................41 3.5.1. Equations satisfying the assumptions of Theorem 3.4.1.............................................................41 3.5.2. Stochastic delay equations.........................................................................................................43 3.5.3. Stochastic wave equations..........................................................................................................45 4. Comparison of the results...................................................................................................................46 4.1. Finite-dimensional case..................................................................................................................46 4.2. Stochastic delay equations.............................................................................................................47 5. On the relation between the Itô and Stratonovich integrals in Hilbert spaces.....................................47 6. Conclusions........................................................................................................................................49 References.............................................................................................................................................50
Institute of Mathematics, Warsaw Technical University, Pl. Politechniki 1, 00-661 Warszawa, Poland
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