We used his book then too, at Drexel in Philadelphia. Our prof at the time invited Dr Strang to guest lecture one time and I remember it being so clear and obvi

We used his book then too, at Drexel in Philadelphia. Our prof at the time invited Dr Strang to guest lecture one time and I remember it being so clear and obvious as he talked that I thought “wow this is why an MIT education is so revered”. I waited after the lecture to personally thank him and have him autograph the textbook; very glad I did in retrospect.