Here's my next iteration on note taking with GNU Emacs. Now you can write
simple formula in WYSIWYG manner while taking quick notes in Emacs.

*Code:*

https://gitlab.com/atamariya/emacs/-/blob/dev/lisp/svg.el
https://gitlab.com/atamariya/emacs/-/blob/dev/lisp/formula.el

*Video:* https://youtu.be/1343m3LY4mo
*Details:*
https://lifeofpenguin.blogspot.com/2021/11/formula-editor-in-gnu-emacs.html