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Re:NIST Digital Library of Mathematical Functions by bfirsh on Thursday December 24, 2020 @12:50PM (#25529663)
It's own format, which is a rough semantic representation of a LaTeX document: https://dlmf.nist.gov/LaTeXML/manual/schema/

There are ways of exporting MathML within that schema, I think.

Re:NIST Digital Library of Mathematical Functions by kevinb7 on Thursday December 24, 2020 @02:12PM (#25530435)
The site has MathML (pMML) representations that can be downloaded.