Prof. Richard Stanley
This is a graduate-level course in combinatorial theory. The content varies year to year, according to the interests of the instructor and the students. The topic of this course is hyperplane arrangements, including background material from the theory of posets and matroids.
OCW has published multiple versions of this subject.
Stanley, Richard. 18.315 Combinatorial Theory: Hyperplane Arrangements, Fall 2004. (MIT OpenCourseWare: Massachusetts Institute of Technology), http://ocw.mit.edu/courses/mathematics/18-315-combinatorial-theory-hyperplane-arrangements-fall-2004 (Accessed). License: Creative Commons BY-NC-SA