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Finance Theory I by Prof. Andrew Lo: https://ocw.mit.edu/courses/sloan-school-of-management/15-40.... You can view the first lecture here: https://www.youtube.com/watch?v=HdHlfiOAJyE&list=PLUl4u3cNGP....

Prof. Lo taught this course at MIT in the Fall of 2008, which you can imagine would be a very interesting time to teach finance. The course is excellent. I think you'll really enjoy it.