It turns out that lecture 6a and 6b are duplicated. Duplicated Video Haisheng 2008-12-28 02:56:32 2008-12-28 02:56:32 5 The classical lectures accompanying the textbook of the same name. There were recorded in great quality, and the teachers are excellent. This isn't outdated at all! You can still learn the principles here. Great (tough 10a is missing!!) juanimela 2010-12-09 16:24:40 2010-12-09 16:24:40 5 2 5.00