I've been reading this on and off over the last few months. I just want to say that the linear algebra material is excellent and really helpful. It's conversati

I've been reading this on and off over the last few months. I just want to say that the linear algebra material is excellent and really helpful. It's conversational and yet it's pitched at the style/standard of linear algebra you'd get if you were taking it as an introductory course in a pure math sequence (i.e. abstract vector spaces and linear transformations, matrices and vectors of coordinates only enter when you have a basis, etc), and yet it stays focused on the core important topics; other linear algebra courses I've been working on have got a bit too theoretical/fancy too early (e.g. quotient spaces and rings and ideals and vector spaces over finite fields), when I felt like I should be focusing more on eigenvectors and orthonormal bases and more basic stuff like that, as PIM does.