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\setlength\fboxrule{2pt}\setlength\fboxsep{2mm} \fbox{ Let $f:[0,1] \to \mathbb{R}$ be a continuous function. If $f$ is infinitely differentiable, \ then prove that $f$ coincides with a polynomial.}

When i use this command, boxes are being created but the text is not aligning properly, means the text doesn't take the next line automatically it continues in some erratic manner. I hope someone is able to understand what i want to say.

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3  
You'd be best off creating a minimal example. What's needed is a complete .tex file which both manifests the problem and includes nothing not required to make the problem occur. –  vanden Sep 16 '10 at 16:20
2  
Why do you have the \ after the comma? That's going to put two spaces, the first one of which will be slightly larger because it comes after the comma, the second will be a normal intrasentence space. As a side note, your mathematical statement is incorrect. –  TH. Sep 17 '10 at 1:53
    
Why did you use a blockquote (> ) instead of a code block (indent with four spaces by selecting code and clicking the toolbar button consisting of 1s and 0s)? –  SamB Dec 27 '10 at 22:37
    
Also \colon not :. The usual : has the wrong spacing for function definitions (but correct spacing for e.g. $\{ x : x > 0 \}$. –  jmc Feb 4 at 14:40

1 Answer 1

up vote 4 down vote accepted

What you describe isn't improper; it's normal behavior for \fbox, which does not put its text in paragraph mode.

You either need to use a parbox inside the fbox, as so:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
    \noindent\setlength\fboxrule{2pt}\setlength\fboxsep{2mm}% 
    \newlength{\boxwidth}%
    \setlength{\boxwidth}{\textwidth}%
    \addtolength{\boxwidth}{-2\fboxrule}%
    \addtolength{\boxwidth}{-2\fboxsep}%
    \fbox{\parbox{\boxwidth}{Let $f:[0,1] \to \mathbb{R}$ be a continuous function. If $f$ is infinitely differentiable, \ then prove that $f$ coincides with a polynomial.}}
\end{document}

Or better, yet use the framed package and its namesake environment.

\documentclass{article}
\usepackage{amsmath,framed}
\begin{document}
    \setlength{\FrameRule}{2pt}
    \setlength{\FrameSep}{2mm}
    \begin{framed}
        \noindent Let $f:[0,1] \to \mathbb{R}$ be a continuous function. If $f$ is infinitely differentiable, \ then prove that $f$ coincides with a polynomial.}
    \end{framed}
\end{document}
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