By default, Latex uses parentheses to bracket equation numbers (i.e.,
to the right of each equation). To use square brackets, put this syntax
toward the beginning of your document:
`\makeatletter`
`\def\@eqnnum{{\normalfont\normalcolor[\theequation]}}`
`\makeatother`

Obviously, you could riff off of this to make other formatting changes to the equation labels.

Last modified: 12/22/09.

Chris Paciorek 2012-01-21