Difference between "inline" Mathjax and "block-level" Mathjax.

Mathjax

For equations on the same line, surround the equation with backslash-escaped parentheses like this: \( i^i \)

To put an equation on its own line, use backslash-escaped square brackets like this:

\[ i^i \]

or double dollar signs:

$$ i^i $$