How to break long solutions in exam class?

Question

I am currently using the exam class to write up the solutions to a take-home exam, but I am having issues when my solutions are too big to fit a page. I either have huge gaps in my paper or solutions that spill over the page and never make it to the next one. So what I need is to find a way to break the solution \fbox into multiple boxes.

I don't mind a solution where I have to manually tweak the contents of each solution box, but if that can be done automatically that would be even better. I would also really like it if boxes comprising the same solution could be "open-ended" to show that they belong together.

Just for the sake of completeness, here's some extra info:

• I tried splitting solutions manually by just adding things like \end{solution}\newpage\begin{solution} to no avail.

• I also tried reading exam.cls (I have version 2.4, 2011/05/22) to see if I could hack it myself, and saw a comment (line 70) that page breaks were in fact supposed to be possible within the solution environment, but they don't seem to work for me.

• This question reports the same issue, but since there was no solution and my comment would probably not get any attention, I decided to repost the reformulated question including the following MWE:

\documentclass[a4paper,12pt,answers]{exam}
\usepackage{amsmath,amssymb,amsthm}

\begin{document}

\begin{questions}

\question Let $A \in \mathbb{R}^{n \times n}$, possibly singular. Show there exists $\epsilon \neq 0$ such that  $A+\epsilon I$ is n.

\begin{EnvFullwidth}
\begin{solution} \01 REALLY LONG SOLUTION \02 REALLY LONG SOLUTION \03 REALLY LONG SOLUTION \04 REALLY LONG SOLUTION \05 REALLY LONG SOLUTION \06 REALLY LONG SOLUTION \07 REALLY LONG SOLUTION \08 REALLY LONG SOLUTION \09 REALLY LONG SOLUTION \10 REALLY LONG SOLUTION \11 REALLY LONG SOLUTION \12 REALLY LONG SOLUTION \13 REALLY LONG SOLUTION \14 REALLY LONG SOLUTION \15 REALLY LONG SOLUTION \16 REALLY LONG SOLUTION \17 REALLY LONG SOLUTION \18 REALLY LONG SOLUTION \19 REALLY LONG SOLUTION \20 REALLY LONG SOLUTION \21 REALLY LONG SOLUTION \22 REALLY LONG SOLUTION \23 REALLY LONG SOLUTION \24 REALLY LONG SOLUTION \25 REALLY LONG SOLUTION \26 REALLY LONG SOLUTION \27 REALLY LONG SOLUTION \28 REALLY LONG SOLUTION \29 REALLY LONG SOLUTION \30 REALLY LONG SOLUTION \31 REALLY LONG SOLUTION \32 REALLY LONG SOLUTION \33 REALLY LONG SOLUTION \34 REALLY LONG SOLUTION \35 REALLY LONG SOLUTION \36 REALLY LONG SOLUTION \37 REALLY LONG SOLUTION \38 REALLY LONG SOLUTION \39 REALLY LONG SOLUTION \40 REALLY LONG SOLUTION \41 REALLY LONG SOLUTION \42 REALLY LONG SOLUTION \43 REALLY LONG SOLUTION \44 REALLY LONG SOLUTION \45 REALLY LONG SOLUTION \46 REALLY LONG SOLUTION \47 REALLY LONG SOLUTION \48 REALLY LONG SOLUTION \49 REALLY LONG SOLUTION \50 REALLY LONG SOLUTION \51 REALLY LONG SOLUTION \52 REALLY LONG SOLUTION \53 REALLY LONG SOLUTION \54 REALLY LONG SOLUTION \55 REALLY LONG SOLUTION \56 REALLY LONG SOLUTION \57 REALLY LONG SOLUTION \58 REALLY LONG SOLUTION \59 REALLY LONG SOLUTION \60 REALLY LONG SOLUTION \\end{solution}
\end{EnvFullwidth}

\end{questions}

\end{document}

Thanks a lot for the attention!

Answer 1

use it without the

\begin{EnvFullwidth}
...
\end{EnvFullwidth}

or define a command \SetTotalwidth which does the same but allows a pagebreak

\documentclass[a4paper,12pt,answers]{exam}
\usepackage{amsmath,amssymb,amsthm,lipsum}

\makeatletter
\def\SetTotalwidth{\advance\linewidth by \@totalleftmargin
\@totalleftmargin=0pt}
\makeatother

\begin{document}

\begin{questions}
\question Let $A \in \mathbb{R}^{n \times n}$, possibly singular. Show there exists $\epsilon \neq 0$ such that  $A+\epsilon I$ is n.

\SetTotalwidth
\begin{solution}\noindent
\lipsum
\end{solution}

\end{questions}

\begin{questions}

\question Let $A \in \mathbb{R}^{n \times n}$, possibly singular. Show there exists $\epsilon \neq 0$ such that  $A+\epsilon I$ is n.
\begin{solution}
\lipsum[5]
\end{solution}
\end{questions}

\end{document}