OCR lib for math formulas

InftyReader is the only one I'm aware of. It is NOT free software (it seems the money goes to a non-profit org, IIRC).

http://www.sciaccess.net/en/InftyReader/

I don't know why PDF can't have metadata in LaTeX? As in: put the LaTeX equation in it! Is this so hard? (I dunno anything about PDF syntax, but I imagine it can be done).

LaTeX syntax is THE ONE TRIED AND TRUE STANDARD for mathematics notation. It seems amazingly stupid that folks that produced MathML and other stuff don't take this in consideration. InftyReader generates MathML or LaTeX syntax.

If I want HTML (pure) I then use TTH to read the LaTeX syntax. Just works.

ABBYY FineReader (a great OCR program) claims you can train the software for Math, but this is immensely braindead (who has the time?)

And Unicode has lots of math symbols. That today's OCR readers can't grok them shows the sorry state of software and the brain deficit in this activity.

As to "one symbol at a time", TeX obviously has rules as to where it will place symbols. They can't write software that know those rules?! TeX is even public domain! They can just "use it" in their comercial products.

Check out "Web Equation." It can convert handwritten equations to LaTeX, MathML, or SymbolTree. I'm not sure if the engine is open source.

SESHAT is a open source system written in C++ for recognizing handwritten mathematical expressions. SESHAT was developed as part of a PhD thesis at the PRHLT research center at Universitat Politècnica de València.

An online demo:http://cat.prhlt.upv.es/mer/

The source: https://github.com/falvaro/seshat

Seshat is an open-source system for recognizing handwritten mathematical expressions. Given a sample represented as a sequence of strokes, the parser is able to convert it to LaTeX or other formats like InkML or MathML.

According to the answers on Metaoptimize and the discussion on the Tesseract mailinglist, there doesn't seem to be an open/free solution yet which can do that.

The only solution which seems to be able to do it (but I cannot verify as it is Windows-only and non-free) is, like a few other people have mentioned, the InftyProject.