## A few issues about math input

When you see an math equation, you can point your mouse to it, then the tex code will be displayed. A single click will display the codes in a pop up window. Double dollar signs are needed to display math inline. For exqmple \$\$ f(x)=\int_{-\infty}^x~e^{-t^2}dt \$\$ will give you this: $$\frac{1}{b-a}\int_a^b f(x)dx$$.

\$f(x)=\int_{-\infty}^x~e^{-t^2}dt \$ will not be converted to math symbols, so ideally this is a good way to show latex code.