I hadn't thought about the math OCR (nor 'fair use', obviously), since intro books tend to use very simple math. But your point with variable names seems especi

I hadn't thought about the math OCR (nor 'fair use', obviously), since intro books tend to use very simple math. But your point with variable names seems especially difficult.. thanks! For more verbose subjects like bio, or psych, or econ something like the software they use to check for plagiarism should work beautifully.