How to define a LaTeX macro in a Markdown cell of a Jupyter Notebook?

Question

I want to define a macro in a Markdown cell of a Jupyter notebook. But it seems that we cannot define it.

For example, I want to define a macro which formats vectors. The code in the cell is:


ewcommand{\vect}[1]{{\mathbf{\boldsymbol{{#1}}}}}

This is the vector $\vect{x}$.

The rendering is:

PS The question was asked at https://tex.stackexchange.com/questions/281535/latex-macros-in-markdown, but it is not relevant directly to LaTeX, and the question was tagged as off-topic.

user_5422354 · Answer

The way to define a macro in a Jupyter cell is to put a dollar in front of and after the macro.

$
ewcommand{\vect}[1]{{\mathbf{\boldsymbol{{#1}}}}}$
This is the vector $\vect{x}$.

and the rendering is:

PS This is the trick used at Latex macros in Jupyter (iPython) notebook not rendered by github, but the topic is slightly different.