# Upper and lowercase of a word in the \section heading

I'm using the \section command and wanted to change just two letters of a word to be in lowercase. How can I accomplish this? I have tried using \small command but it will not change it.

\section{Writing and Reading Using \small{rs}EGFP's}


Thanks

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Which document class are you using? – Gonzalo Medina Aug 6 '12 at 23:09
Are you looking to lowercase a part of a word, or to render it smaller than the surroundings? The command \small affects the size of the type, not whether the subsequent word is set in lowercase (or uppercase). – Mico Aug 6 '12 at 23:40

You might be looking for \MakeLowercase:

\section{Writing and Reading Using \MakeLowercase{rs}EGFP's}

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 Thank you this worked perfectly. – J Paul Aug 8 '12 at 15:49

I'm not sure if I understand your question, but I have a feeling that you're looking to typeset a part of the section header smaller than its surroundings. However, if you are in fact looking to force some characters to be typeset in uppercase or lowercase, do see @GonzaloMedina's answer for a demonstration of the use of the command \MakeLowercase (and its twin, \MakeUppercase).

By the way, the command \small does not take an argument but affects all subsequent material until the end of the "group" that contains the \small command is reached. Thus, don't write \small{rs} but, rather, {\small rs}. Because the relative font size used in section headings is \Large, which is two steps up from \normalsize, and because \small is one step smaller than \normalsize, use of the command \small results in text in the section header that's three (relative) steps smaller than the surroundings.

If you're looking to reduce the font size by a number of steps without needing to know what the absolute font size currently in use may be, you could use the relsize package and its \smaller and \relsize{-2} commands. The following MWE shows how this may be done.

\documentclass{article}
\usepackage{relsize}
\begin{document}
\section*{Writing and Reading using rsEGFPs}             % no change in size
\section*{Writing and Reading using {\smaller rs}EGFPs}  % 1 step smaller
\section*{Writing and Reading using {\relsize{-2}rs}EGFP's} % 2 steps smaller
\section*{Writing and Reading using {\small rs}EGFPs}    % 3 steps smaller
\end{document}


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You want \lowercase{} to force the text to remain in lowercase, so this would be:

\section{Writing and Reading Using \lowercase{rs}EGFP's}

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\lowercase comes from TeX and might not always behave well in LaTeX documents: compare \lowercase{\OE} and \MakeLowercase{\OE}. – Gonzalo Medina Aug 6 '12 at 23:31
The output is identical for me. – Karalga Aug 6 '12 at 23:46
Using \documentclass{article} \begin{document} \lowercase{\OE} and \MakeLowercase{\OE} \end{document} you'll see that \lowercase has no effect, whereas \MakeLowercase produces the desired output. – Gonzalo Medina Aug 6 '12 at 23:50
ok, you are right; but inside an \MakeUppercase neither of them work on \OE: \documentclass{article} \begin{document} \MakeUppercase{\lowercase{\OE} and \MakeLowercase{\OE}} \end{document}. – Karalga Aug 6 '12 at 23:57