There is [a problem with the rendering of matrix brackets](https://pykale.github.io/transparentML/00-prerequisites.html#scalars-vectors-matrices-and-basic-operations). This seems a [known open issue](https://github.com/executablebooks/jupyter-book/issues/1696) of jupyter book. I have tried the the source code in [this jupyter book](https://bvanderlei.github.io/jupyter-guide-to-linear-algebra/Solving_Systems.html) but does not work.