[posterboy]

> Sometimes they are literally an OCR of the print book! You can tell because of the symbol substitutions.

Not really. TEX for example does a lot of weird character substitution behind the scenes to mangle the layout.

[InitialLastName]

how often does TEX substitute "rn" for "m" though?

[kqr]

Comma instead of subscript i is one of my pet peeves.