Text Formatting ⇒ command textbackslash invalid in math mode

[Tayco]

Hi there could someone help me with this error messgage:

command textbackslash invalid in math mode

Code: Select all

{\fontsize{10pt}{12.0pt}\selectfont  $\textbackslash$ def$\textbackslash$ cp$ \{ $ $\textbackslash$ textit$ \{ $ cp.$ \} $ $ \} $ \  \par}\par

It compiles source code in PDF not as an text but as simple pdf version of code text.

[Ijon Tichy]

Why do you switch to the math mode to use the text command \textbackslash?

What is the expected result?

Code: Select all

\documentclass{article}

\begin{document}
{\fontsize{10pt}{12.0pt}\selectfont \textbackslash def\textbackslash cp \{ \textbackslash textit \{ cp. \} \} \ \par}\par

\end{document}

or

Code: Select all

\documentclass{article}

\newcommand*{\cp}{\textit{cp.}}
\begin{document}
\cp
\end{document}

or

Code: Select all

\documentclass{article}
\begin{document}
\verb|\def\cp{\textit{cp.}}|
\end{document}