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Especially things like fractions and exponents?

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This is probably not a good/complete/working solution, but may still be of some use. Use pdftk to convert your pdf to uncompressed, e.g., on linux: "pdftk foo.pdf output foou.pdf uncompress" The resulting pdf file is a text file that you can open in an editor. You may be able to find certain strings in there that indicate the presence of a certain thing like a fraction. – Ben Crowell Jul 24 '11 at 19:27
Wow interesting. Does pdftk convert most TeX equations into something that's maybe 50% legible and 50% illegible? – InquilineKea Jul 24 '11 at 20:05

This would probably only work if you use a modern engine (e.g. XeTeX or LuaTeX), use only Unicode in your document (including Unicode-Math), use only OpenType fonts (include OpenType-Math), and work with a PDF viewer that can handle Unicode on a Unicode-capable OS.

So it may work with the latest ConTeXt MkIV on any recent OS.

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