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to HTML via XSLT
arrays

The LaTeX array column delimiter '&' used unadorned in an embedded formula would be confused with the HTML use of the same character. One solution is to type out the HTML character entity '&' for the character:

\begin{array}[pos]{r|l|c} a_{11} & a_{12} & a_{13} \\ a_{21} & a_{22} & a_{23} \\ a_{31} & a_{32} & a_{33} \end{array}

The '&' can be used directly by wrapping the whole LaTeX formula in a CDATA section: