Placing text and equations inside a box

I have a paragraph that contains text, inline equations and centred equations, and I'd like to put the whole thing in a box that's centred horizontally in the page. It's a key paragraph, so I wanted to box it so that it stands out. I just want a simple box: black outline, white fill, no curved corners. I had a look at questions with similar titles, but couldn't find anything that both worked and suited my needs. If it helps, see below for the particular paragraph I want to put in a box:

\documentclass[12pt article] \usepackage \usepackage \begin Let $a(b) = \left\< \begin hi & \mbox t^5 \mbox < reduced>\\ t & \mbox \end \right.$, $xyz = \left\< \begin GH & \mbox tr^ <\pi>\mbox < secluded>\\ x& \mbox \end \right.$, $s = \left\< \begin up^ & \mbox t^55 \mbox < reduced>\\ lo & \mbox \end \right.$. \\ \\ Define the magician $M_n$ recursively, where $M_1 = \bigstar$ and \begin $ \begin M_ = tr(Md) \\ M_ = norbert(2304) \\ Mtri = solution \end $ \end where $z$ is the smallest integer such that $z \notin \< 0 \>$. Terminate the magician at $M_$ where $3$ is such that $M_, . , M_$ have all already appeared in $M_1, . , M_,$ i.e. \begin $ Mtr = g, \underbrace_<\mbox>, \underbrace_ <\mboxg> , . \ , M_, M_, M_ $ \end where $i$ is smallest such that $rt \neq z$. \end

Thanks! I wasn't sure what tags to use - I'd welcome any changes.

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asked Jan 11, 2012 at 16:44

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In case anyone was wondering from the content - yes, this is part of a breakthrough paper in mathematics that will change the way we view everything

Commented Jan 11, 2012 at 16:45