1 Introduction
1.1 Stochastic Analogs of Classical Differential Equations
1.2 Filtering Problems
1.3 Stochastic Approach to Deterministic Boundary Value Problems
1.4 Optimal Stopping
1.5 Stochastic Control
1.6 Mathematical Finance
2 Some Mathematical Preliminaries
2.1 Probability Spaces, Random Variables and Stochastic Processes
2.2 An Important Example: Brownian Motion
Exercises
3 Ito Integrals
3.1 Construction of the It5 Integral
3.2 Some properties of the It5 integral
3.3 Extensions of the Ito integral
Exercises
4 The Ito Formula and the Martingale Representation
Theorem
4.1 The 1-dimensional It5 formula
4.2 The Multi-dimensional It5 Formula
4.3 The Martingale Representation Theorem
Exercises
5 Stochastic Differential Equations
5.1 Examples and Some Solution Methods
5.2 An Existence and Uniqueness Result
5.3 Weak and Strong Solutions
Exercises
6 The Filtering Problem
6.1 Introduction
6.2 The 1-Dimensional Linear Filtering Problem
6.3 The Multidimensional Linear Filtering Problem
Exercises
7 Diffusions: Basic Properties
7.1 The Markov Property
7.2 The Strong Markov Property
7.3 The Generator of an It5 Diffusion
7.4 The Dynkin Formula
7.5 The Characteristic Operator
Exercises
8 Other Topics in Diffusion Theory
8.1 Kolmogorov's Backward Equation. The Resolvent
8.2 The Feynman-Kac Formula. Killing
8.3 The Martingale Problem
8.4 When is an It5 Process a Diffusion?
8.5 Random Time Change
8.6 The Girsanov Theorem
Exercises
9 Applications to Boundary Value Problems
9.1 The Combined Dirichlet-Poisson Problem. Uniqueness
9.2 The Dirichlet Problem. Regular Points
9.3 The Poisson Problem
Exercises
10 Application to Optimal Stopping
10.1 The Time-Homogeneous Case
10.2 The Time-Inhomogeneous Case
10.3 Optimal Stopping Problems Involving an Integral
10.4 Connection with Variational Inequalities
Exercises
11 Application to Stochastic Control
11.1 Statement of the Problem
11.2 The Ha.milton-Jacobi-Bellman Equation
11.3 Stochastic control problems with terminal conditions
Exercises
12 Application to Mathematical Finance
12.1 Market, portfolio and arbitrage
12.2 Attainability and Completeness
12.3 Option Pricing
Exercises
Appendix A: Normal Random Variables
Appendix B: Conditional Expectation
Appendix C: Uniform Integrability and Martingale
Convergence
Appendix D: An Approximation Result
Solutions and Additional Hints to Some of the Exercises..
References
List of Frequently Used Notation and Symbols
Index
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