## using roman letter in Latex

(Original Post: http://nw360.blogspot.com/2007/09/roman-numerals-in-latex.html)

Ok, we have to admit that it is not easy to input roman numerals in Latex. There is still a way.
In the preamble, i.e. before \begin{document}, define

\makeatletter
\newcommand{\rmnum}[1]{\romannumeral #1}
\newcommand{\Rmnum}[1]{\expandafter\@slowromancap\romannumeral #1@}
\makeatother

Then in the document part, \rmnum{num} is used to input the roman numeral of num,\Rmnum is for the uppercase. If you prefer to use other commands, just change the red part in the definition part.