5 years of physics+4 years of phd in astrophysics and this man managed to give me a much clearer picture of algebra operations than what I got from all my professors.Thank you so much for these lectures Proff. Strang!####[['Proff. Strang', 'Instructor', 'POS'], ['lectures', 'Course_General_Feedback', 'POS'], ['algebra operations', 'Mathematical_Related_Concept', 'POS'], ['professors', 'Instructor', 'NEG']]