Ito Process Expectation
That equation is similar to the Langevin equation used in physics to describe the Brownian motion of a particle subjected to a potential in a viscous fluid. We now introduce the most important formula of Ito calculus. Expectation And Variance Of Stochastic Differential Equations Mathematics Stack Exchange T 0 g and f bXtt. Ito process expectation . The terms Rt 0 σtdB t and Rt 0 tdt are called diffusion and drift terms respectively. 2 Calculate int_0T. Lemma 7 If h is a process in L2 aT then there exists a sequence fhng n 1 of simple processes such that lim n1 E Z T 0 jh t hnj 2 dt lim n1 kh hnk L2 aT 0. Be an Ito process dX. The value a 0 will correspond to the usual Brownian motion. This is the Markov property. Furthermore tt is a stopping time for each fixed t. Calculate Esum W_t_it_i1 - t_i and take the limit as you shrink the size of the partition. Thus it is natural that the Itˆo integral is also defined by an approximation procedure. But in general ca...