How To Convert PDF Online?
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How can I convert equations in a PDF to LaTeX code?
PDFs aren't necessarily linearly put together, but rather in blocks. So an equation isn't necessarily from the same part of the file, even though it appears on the same part of the page. The only real, dependable hope would be to somehow parse it OCR-style. Apparently inftyproject tries to do this, although I haven't tested it personally
Convert PDF: All You Need to Know
I've got a Python script that extracts the equations. This is still pretty hack, but I can definitely see it working. There's also a lot of other files in there, most of which probably need to be extracted in their entirety. It might be possible to use a similar technique to read the text directly from the zip files. Unfortunately this would have to read all the text of the file at once and probably would be an operation that would take a while (unless the machine has much more memory). The other side of having a bunch of text files in a zip file is in the format of the PDF itself. In the PDF file there's no explicit reference to any of the parts, so you do lose information if, say, you do have a page that refers to a different page for each individual part in the file..
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