Sure thing, a quick search yields Asciimath which seems at least at first glance as huge improvement in the syntax department: http://asciimath.org As for LaTeX in general, Markdown beats it soundly in most aspects. - Source: Hacker News / about 1 year ago

What are the syntax differences to https://asciimath.org? - Source: Hacker News / over 1 year ago

I did some Googling, and thought AsciiMath is the answer (simply because it also contains "Ascii" in the name). Turns out it's a different solution. Source: almost 2 years ago

Math syntax is a bit more challenging, because I'm sure no one wants 12 even if that would make the grammar simpler. Attempts to do this are thin on the ground: as you note, Markdown and other similar tools completely punted on math. AsciiMath is one idea, although not what you want in a full-fledged typesetting language. Source: almost 2 years ago

I like to use asciimath for this, though I realize that it's not as powerful as LaTeX or MathJax. There's a decent Rust port: asciimath-rs. Source: about 2 years ago

An Android tablet and the CoolReader app. For me, it's simply the best eReader experience available. It's incredibly customisable. The only downside is it doesn't support PDF or AZW3, both of which can be reformatted to your preferred file type with Calibre anyway. Source: over 1 year ago

Cool reader is also another option https://sourceforge.net/projects/crengine/. Source: about 3 years ago