REVTeX 3.0 permits two methods for numbering equations. You
can assign your own equation numbers or you can allow REVTeX to
number for you. Equation numbers are not mandatory, and numbered
and unnumbered equations may be intermixed.
Use the command eqnum{thenumber} to number on your own.
You can also use this command to produce a specific equation
number not normally obtainable, (
), for example.
For automatically numbered single-line and multiline
equations, use the equation and eqnarray environments. You can
use the \[,\] commands and the eqnarray* environment for
unnumbered single-line and multiline equations, respectively.
The command nonumber will suppress the numbering on a single
line of an eqnarray.
If you wish a series of equations to be a lettered sequence,
e.g., (1a), (1b), and (1c), just include the equations or
eqnarray within the mathletters environment.
Finally, to have REVTeX number equations by section, use the eqsecnum style option. See the sample manuscript in Section V for illustrations of these equation numbering options.