Is there a way of representing mathematical formulae within the EAD?

At the moment it is nothing too complex, but the archive of the University Observatory has several
entries along the lines of (I can't do this in E-mailese, either) D sigma over nR.  While the Greek
character set is easily taken care of, is it possible to represent the characters above and below a
horizontal line?

Thank you

Richard Higgins
Durham University Library