Begin & end syntax gets printed as well

[JayKim]

Please see my other reply:

How can I use other language in LaTeX

Obsidian makes use of the Mathjax plugin, which can only be used for equations/math and is it is quite complete. It is not meant to be used for other LaTeX functionalities, such as formatting texts. You can do things like this: $$ \frac{1}{2} $$ Or $$ \frac{\text{hello}}{\text{world}} $$