If you can find it an audio recording of this lecture is also available and it is one of the best lectures in the series. Feynman really brings forward the "so

If you can find it an audio recording of this lecture is also available and it is one of the best lectures in the series. Feynman really brings forward the "soul" of algebra and the illustrates how powerful the art of abstraction is. Audible has all the audio lectures for sale, which is how I got them on my kindle, and I have also seen them floating around the net in other formats. I wish Caltech would release the audio material like they did the books!