Faculty in  Mathematical  Finance             Math Finance Home Conferences Seminars People Open Positions Contact CCF Seminar Qinghua Li Columbia University Title: Optimal Stopping of a Diffusion with a Change Point Abstract: We solve Bayes sequential optimal stopping and impulse control problems of a diffusion, whose drift term has an unobservable parameter with a change point. Once it changes, the parameter can take on any one of several possible values with certain prior probability. The value functions of the optimization and the control problems are characterized as viscosity solutions to non-stationary variational inequalities.Co-authored with Professor Ioannis Karatzas. Date: Monday, October 4, 2010Time: 5:00 pmLocation: Wean Hall 8220Submitted by:  Steve Shreve