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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:

a11 a12 a13
a21 a22 a23
a31 a32 a33

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

a11 a12 a13
a21 a22 a23
a31 a32 a33