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Financial Mathematics
The methods for pricing derivatives (e.g. options) are based on the solution of stochastic differential equations (SDEs). There is a natural connection between  SDE and nonlinear partial differential equations which is not only of academic but also of practical interest. Currently I'm developing a class that is intended to introduce students with mathematical background to finance. This course is based on the book "Financial Calculus" by Baxter & Rennie. If you are interested, please have a look at the syllabus.
Throughout the past decades, a great many methods for solving stochastic equations have been developed in theoretical physics. On particular method are path-integrals. If you want to know more about the application of those techniques in Finance, I recommend to read:

Matacz, A: "Path dependent option pricing: the path integral partial averaging method". [download]                   


For many more links, visit:

 http://guava.physics.uiuc.edu/~nigel/finance.html