Maybe it is me, the material looks really good, but: Minutes into it the notebooks on the page stop working, mainly due to trivial errors, like missing imports

Maybe it is me, the material looks really good, but: Minutes into it the notebooks on the page stop working, mainly due to trivial errors, like missing imports. It is not much use having a 'run' button if you can't run it. The setup is incomplete so you are not going to be running it locally. The introduction to linear algebra assumes you already know abstract algebra.