MathPublish plugin.
To toggle to the math mode, you must use the <m>...</m> tag. The math commands must be separated by a space character or surrounded by {}.
<m>x in bbR \ { 1; 2 }</m>
a~b :
Syntax : matrix{num of lines}{num of columns}{first_element … last_element}
Syntax : tabular{lines description}{columns description}{first_element … last_element}