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Yeah, it looks like subsetting math is beyond what I would be able to do well - subsetting probably has to do with particular fields as far as what would be likely to be useful.
My math typesetting experience is limited to undergrad calculus level so I don't have experience in the more complex but open source math textbooks were always a dream of mine, it angered me that textbooks were so expensive when 95% of the content between two editions were identical, pretty much only the homework questions changed - thus poor students like me couldn't just use the older edition. It was economics that forced me out of college.
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It was actually MathML that introduced me to the Document Object Model - needed Math in a web page circa 2000 and didn't want an image (this was before I discovered LaTeX) and Mozilla had basic MathML support if served as XML - but of course serving as XML broke my JS that at the time was full of document.write()
I know MathML support in eBooks isn't all that universal yet, but ePub with MathML seems like a path towards open source math books and a better choice than LaTeX to PDF.
Learning about the DOM was a lightbulb moment, seeing content as a collection objects made a lot of sense.
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