A good (video) lecture on SVD (singular value decomposition) that forms the basis for LSI (to be discussed next week)

You might want to check out this lecture on SVD from Gilbert Strang's course on linear algebra, if want to get a good background on the development

http://ocw.mit.edu/courses/mathematics/18-06-linear-algebra-spring-2010/video-lectures/lecture-29-singular-value-decomposition/

rao