You can use LaTeX to define equations and plots.

To define a piece of LaTeX, place the code between [ latex ]…[ /latex ] (without the spaces between the square brackets).

We have several packages loaded that allow you to plot right here in WordPress. Below are some examples.

Matrices

\begin{bmatrix} u_{11} & u_{12} & u_{13} \\ 0 & u_{22} & u_{23} \\ 0 & 0 & u_{33} \\ \end{bmatrix}