translating doconce text in chapter3.do.txt to ipynb
*** replacing \bm{...} by \boldsymbol{...} (\bm is not supported by MathJax)
collected all required additional files in ipynb-chapter3-src.tar.gz which must be distributed with the notebook
*** warning: latex envir \begin{bmatrix} does not work well in Markdown.
    Stick to \[ ... \], equation, equation*, align, or align*
    environments in math environments.

*** warning: latex envir \begin{bmatrix} does not work well in Markdown.
    Stick to \[ ... \], equation, equation*, align, or align*
    environments in math environments.

*** warning: latex envir \begin{bmatrix} does not work well in Markdown.
    Stick to \[ ... \], equation, equation*, align, or align*
    environments in math environments.

*** warning: latex envir \begin{cases} does not work well in Markdown.
    Stick to \[ ... \], equation, equation*, align, or align*
    environments in math environments.

Failed to remove ans_at_end environment
Failed to remove sol_at_end environment
output in chapter3.ipynb