### Math

All the standard math commands in LATEX will work fine and can be used in
NEPTUNE. Inline math commands (`$`

and `\(`

/`\)`

) have the very same functionality
without any differences.

The displayed equation environments of `$$`

, `\[`

/`\]`

, `{equation}`

, `{eqnarray}`

,
`{align}`

, `{gather}`

, `{aligned}`

, `{gathered}`

, `{alignat}`

, `{multline}`

, and all their
starred variants have the very same functionality. Various kinds of fractions, square
roots, matrices and commutative diagrams of `amsmath`

can also be used without any
fear of misfiring.

The functionality associated with complex math commands derived from `xypic`

,
`tikz`

, and the like will also work fine, provided the packages are loaded in the
preamble of the document if not done previously.

However, a small change that has been introduced to augment XML generation from
newly inserted author code is the change of `\label{...}`

to `\xlabel{...}`

. A few
examples are given hereunder:

For single line displayed equation, the syntax is:

\begin{equation}\xlabel{eqn1a} (a+b)^2 = a^2 + 2ab + b^2 \end{equation}

On the contrary, if the displayed equation is multi-lined, the syntax takes the form:

\begin{align} (a+b)^2 & = a^2 + 2ab + b^2\\ (a-b)^2 & = a^2 - 2ab + b^2 \end{align}

If an equation with a custom equation number like `$x_1^2$`

is to be
inserted, here is the way:

\begin{equation}\tag{$x_1^2$} (a+b)^2 = a^2 + 2ab + b^2 \end{equation}