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A Haskell library for converting LaTeX math to MathML.
Haskell TeX C HTML JavaScript XSLT Other

Merge pull request #77 from minoki/ltimes-rtimes-in-tex

Support \ltimes and \rtimes in the TeX reader.
latest commit ceb0557410
@jgm authored



texmath is a Haskell library for converting between formats used to represent mathematics. Currently it provides functions to read and write TeX math, presentation MathML, and OMML (Office Math Markup Language, used in Microsoft Office), and to write pandoc's native format (allowing conversion, using pandoc, to a variety of different markup formats). The TeX reader and writer supports basic LaTeX and AMS extensions, and it can parse and apply LaTeX macros. The package also includes several utility modules which may be useful for anyone looking to manipulate either TeX math or MathML. For example, a copy of the MathML operator dictionary is included.

You can try it out online here. (Note that the math it produces will be rendered correctly only if your browser supports MathML. Firefox does; Safari and Chrome do not.)

By default, only the Haskell library is installed. To install a test program, texmath, use the executable Cabal flag:

cabal install -fexecutable

To run the test suite, compile with --enable-tests and do cabal test.

Macro definitions may be included before a LaTeX formula.

texmath will behave as a CGI script when called under the name texmath-cgi (e.g. through a symbolic link).

The file cgi/texmath.html contains an example of how it can be used.

Generating lookup tables

There are three main lookup tables which are built form externally compiled lists. This section contains information about how to modify and regenerate these tables.

In the lib direction there are two sub-directories which contain the necessary files.


The utility program xsltproc is required. You can find these files in lib/mmldict/

  1. If desired replace unicode.xml with and updated version (you can download a copy from here
  2. xsltproc -o dictionary.xml operatorDictionary.xsl unicode.xml
  3. runghc generateMMLDict.hs
  4. Replace the operator table at the bottom of src/Text/TeXMath/Readers/MathML/MMLDict.hs with the contents of mmldict.hs


You can find these files in lib/totexmath/

  1. If desired, replace unimathsymbols.txt with an updated verson from here
  2. runghc unicodetotex.hs
  3. Replace the record table at the bottom of src/Text/TeXMath/Unicode/ToTeXMath.hs with the contents of UnicodeToLaTeX.hs


You can find these files in lib/tounicode/.

  1. If desired, replace UnicodeData.txt with an updated verson from here.
  2. runghc mkUnicodeTable.hs
  3. Replace the table at the bottom of src/Text/TeXMath/Unicode/ToUnicode.hs with the output.

Editing the tables

It is not necessary to edit the source files to add records to the tables. To add to or modify a table it is easier to add modify either unicodetotex.hs or generateMMLDict.hs. This is easily achieved by adding an item to the corresponding updates lists. After making the changes, follow the above steps to regenerate the table.


John MacFarlane wrote the original TeX reader, MathML writer, and OMML writer. Matthew Pickering contributed the MathML reader, the TeX writer, and many of the auxiliary modules. Jesse Rosenthal contributed the OMML reader. Thanks also to John Lenz for many contributions.

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