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I have the following code:

\documentclass[11pt]{article} \usepackage{enumerate} \usepackage{amsmath} \newenvironment{italic}{\begin{quote}\itshape}{\end{quote}} \DeclareMathOperator{\rad}{rad} \begin{document} \begin{italic} blablabla \begin{displaymath} \rad(R)=\{x\in R\mid x^n=0 \text{ where we consider } n\geq 1\} \end{displaymath} more blablabla \begin{enumerate} \item $x^n$ with $n=1$ \item $y^m$ with $m=2$ \end{enumerate} \end{italic} \end{document}

I'd like the blablabla to be italic, but the text in the mathematical environment (for example "where we consider" and "with") shouldn't be. In my document, I have quite a lot of these blablabla's between mathematical environments, so that's the reason why I use the self-defined italic environment: to save some time and don't have to use \textit or \itshape all the time.

How can I solve this? Is this a good approach?

Edit: I've updated my question and changed the title, because the code I gave in the beginning didn't really reflect my situation. My mistake... I've used the tip to declare rad as a mathematical operator.

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  • Isn't amsmath needed to use \text? Commented Nov 30, 2013 at 23:53
  • @Jeroen Are you trying to write the statement of a theorem? Commented Dec 1, 2013 at 0:23
  • @egreg: Well, it's the formulation of an exercise, so it's not really a theorem. Commented Dec 1, 2013 at 0:25
  • According to the standard typesetting rules, the words ”where we consider” should use the current font, italic in this case. Not “rad”, which is a math symbol and must be upright. Commented Dec 1, 2013 at 0:33
  • @egreg: Really? That would solve my problem immediately! Where can I actually read these typesetting rules? Everyone talks about them, but I don't know where to find them... (sounds stupid) Commented Dec 1, 2013 at 0:42

3 Answers 3

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The \textit macro does not generally control the appearance of the text in the math environment. That's done separately.

In math mode you can use

\mathrm{rad}

Or if this is to be the name of a function you can load the amsmath package in the preamble

\usepackage{amsmath}

and then in the body of the text call

\operatorname{rad}

If this is something you will want to call repeatedly you can define a command to accomplish this:

\usepackage{amsmath} \DeclareMathOperator{\rad}{rad}

and then in the body of the document you can write

\[ \rad(R)=\{x\in R\mid x^n=0 \text{ with }n\geq 1\} \]

If additionally you wish the with not to be set in italics, you can do something like

\text{\normalfont\ with }

or

\textnormal{ with }

You need to make this change within \text{...} because it inherits the style of the fonts outside of the math environment.

enter image description here

You should notice that \normalfont is a switch command like \bfseries which remains in effect until the end of the current group. As \textbf{...} corresponds to {\bfseries ....}, \textnormal{...} corresponds to {\normalfont ...}.

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5

To answer your first question: It does not work because you are in math-mode. On the other hand, if you are not in math-mode, something like

\textit{Blablabla \normalfont{Normalfont Bla} More Bla}

won't work too because normalfont does not take an argument. Try this one to see the difference:

\documentclass{article} \begin{document} \textit{Blablabla {\normalfont Normalfont Bla} More Bla} \end{document}

Moreover you don't need to use math in \textit:

\documentclass[11pt]{article} \begin{document} \textit{blablabla} \begin{displaymath} \mathrm{rad}(R)=\{x\in R\mid x^n=0 \text{ with } n\geq 1\} \end{displaymath} \end{document}

Edit

Regarding your edit:

\documentclass[11pt]{article} \usepackage{amsmath} \let\AMStext\text \newenvironment{italic} {\renewcommand{\text}[1]{\AMStext{\normalfont ##1}} \begin{quote}\itshape} {\end{quote}} \DeclareMathOperator{\rad}{rad} \begin{document} \begin{italic} blablabla \begin{displaymath} \rad(R)=\{x\in R\mid x^n=0 \text{ where we consider } n\geq 1\} \end{displaymath} more blablabla \begin{enumerate} \item $x^n \text{ with } n=1$ \item $y^m \text{ with } m=2$ \end{enumerate} \end{italic} \end{document}
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  • 2
    One can use \textnormal Commented Nov 30, 2013 at 23:43
  • ... which takes one argument and would work in the way as \normalfont was used in the OP (just for completeness :-) Commented Nov 30, 2013 at 23:51
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What A. Ellet said can be simulated in a complete code snippet as follows. thm environment makes the enclosed text italic. As \text inherits the font from the outside environment, the text \text{ with } becomes italic as well. To change it back to normal font, use either \text{ \normalfont with } or \text{ \textnormal{with} }.

\documentclass[preview,border=12pt]{standalone} \usepackage{amsmath,amssymb} \DeclareMathOperator{\rad}{rad} \newtheorem{thm}{Theorem} \begin{document} \begin{thm}[\textbackslash textnormal] \[ \rad(R)=\{x\in \mathbb{R}\mid x^n=0 \text{ \textnormal{with} } n\geq 1\} \] \end{thm} \begin{thm}[\textbackslash normalfont] \[ \rad(R)=\{x\in \mathbb{R}\mid x^n=0 \text{ \normalfont with } n\geq 1\} \] \end{thm} \end{document}

You can also change the symbol R by \mathbb{R} to make it clearer as a real number set. Does it seem to be more fancy?

enter image description here

Note: It is a community wiki answer, just to prevent me from getting reputation points whenever the readers vote it up.

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    Actually, the R marks a ring, not the real number set. :) Commented Dec 1, 2013 at 0:29

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