If you want to emphasise text, you can use the \emph{} command, which will emphasise the text in between the curly brackets, usually by putting it in italics. You can also specify this and other effects more directly:
\emph{} emphasises text (usually italicised)
{\em some_text } also emphasises text (usually italicised) but note the different placing of brackets!
{\bf some_text } emboldens text but note the different placing of brackets!
\textrm{} sets text in the normal Roman fount
\textit{} sets text in italic typeface
\textbf{} sets text in bold typeface
\texttt{} sets text in the "teletype", fixed-width fount
\textsc{} sets text in the "small capitals" typeface;
everything will be in uppercase, but any capital letters will be
typeset slightly bigger than the normal letters
In maths mode there are corresponding commands:
\mathrm{} sets text in the normal Roman fount
\mathtt{} sets text in the "teletype", fixed-width fount
\mathit{} sets text in italic typeface
\mathbf{} sets text in bold typeface
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