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Re:KaTeX – The fastest math typesetting library for the web by snicker7 on Sunday October 11, 2020 @02:48AM (#24744179)
You should look into GNU TeXMacs [^0]. Its formulas (and document structure) are composed of S-Expressions that the user can edit directly. But it has a "TeX"-like UI (typing '\int' renders an integral symbol). Producing documents is an order of magnitude faster than LaTeX. And the quality is comparable.

[^0] https://www.texmacs.org/tmweb/home/welcome.en.html

Re:KaTeX – The fastest math typesetting library for the web by copperx on Sunday October 11, 2020 @06:20PM (#24749594)
What a terrible name! You have to read the documentation to discover the typesetting is not based on TeX, and the editor isn't Emacs.
Re:KaTeX – The fastest math typesetting library for the web by lejalv on Sunday October 11, 2020 @04:07AM (#24744395)
The TeXmacs book is just out: https://www.scypress.com/book_info.html