How to put a box around multiple lines.:
\documentclass{article}
\let\vec\mathbf
\begin{document}
\fbox{%
\parbox{0.8\linewidth}{%
Given the vectors $\vec p$ and $\vec n$ as input, and the function $f$,
find the scalar $\lambda$ that minimizes $f(\vec p + \lambda \vec n)$.
Replace $\vec p$ by $\vec p + \lambda \vec n$.
Replace $\vec n$ by $\lambda \vec n$.%
}%
}
\end{document}
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