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There are a number of possibilities to have multiline equations, but I am looking for multiline \text{...} elements. For example:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
a^3 + b^3 \neq c^3 \text{ I have discovered a truly marvelous proof of this,\\which this margin is too narrow to contain.}
\end{equation}
\end{document}
Is there a way to break that long text into two lines? The \\ does not work here.
To reserve a box for text of a given size, use the \parbox macro.
\parbox[position]{width}{text}
position (optional): LaTeX will position the box, such that its center lines up with the surrounding text. Possible values can be t or b
width (mandatory): Specifies the width. The width needs a unit like em, cm, ex, etc...
text (can be empty): Your text, of course.
Keep in mind, that multiline text inside a box needs to be fit into the paragraph and therefore heavily disrupts your spacing!
\documentclass{article}
\pagestyle{empty}
\begin{document}
\begin{equation}
a^3 + b^3 \neq c^3 \; \parbox{15em}{I have discovered a truly marvelous proof of this,\\which this margin is too narrow to contain.}
\end{equation}
\end{document}
and,where,orare placed inside mathmode to concatenate the various terms. Also, please always provide a fully featured minimal working example (MWE), your question are highly more likely to get answered then.\textis meant rather for short annotations, but sometimes I feel it's better to put the text there than in an\intertextor in a footnote.