Custom LaTeX commands

[Reimbar]

It would be nice to store a list of user-defined commands to be loaded into each LaTeX block.

When I work on my regular .tex files, I like to define shortcuts such as \N for \mathbb{N}, \zo for {0,1}, etc.

[WhiteNoise]

there is plugins now for this

raineszm/obsidian-latex-environments

[saf-dmitry]

I think the OP is looking for something like this:

New Plugin: MathJax extended + preamble

I’ve added support for the MathJax mhchem and bussproofs packages, extending the usefulness of the Obsidian MathJax engine. I’ve also added support for a MathJax preamble, useful for defining common macros. The preamble is defined in a preamble.sty file in the root of the vault. I’ve got plans for this plugin, including optionally using Latex rather than MathJax to have access to all the usual goodies and packages. Github: https://github.com/xldenis/obsidian-latex

[joeyuping]

Hi!

I wrote a plug in for speeding up latex math typing, and I have recently included a custom shorthand function, so that you may use any two-letter shorthand to denote any latex expression.

The plugin can be found in community plugin list with the name “quick latex for obsidian”
You may customize your own shorthand within the plugin settings page.

And here is the source code:

GitHub - joeyuping/quick_latex_obsidian

Hope this might meet your needs~