Text inside mathematical expressions

Note: click with the right mouse button on any WebEQ equation to bring up a font size control panel.

The \text command allows no formatting of text other than the use of spacing entities. Dollar sign delimited math can be nested in \text material.
Note that thin spaces should be put around the text to separate it from the symbols around the text.

f(x) = \left \{ \array { \arrayopts{\colalign{left}}
                 1 \quad \text{for} \quad  x\in \mathbf{Q} \\
                 0 \quad \text{otherwise} }
       \right

More information on these commands may be found in Changing Fonts: Text boxes of the WebTeX documentation.