These are very niece explanation of Linear Transformations and  Their Matrices  thanks once again to the godfather of linear DR. Gilbert Strang. I took introductory linear algebra at the University of Maryland Baltimore County  in the late 1980's and my professor was nothing close to what Dr. Strang is. This MIT legend is a rare find.####[['DR. Gilbert Strang', 'Instructor', 'POS']]