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If anyone's having the same issue that I was, I found a partial solution on page 109 of the " Math mode " document using the cline command - it shows how to make a box around a row or column. I'm still unsure how to get a box around the diagonal of a matrix, but if I make any progress, I'll post ...

I have a matrix
$\begin{pmatrix}
a & b & c \\
d & e & f \\
g & h & i
\end{pmatrix}$
and I'd like to be able to draw a loop around the diagonal a-e-i. I know that I've seen something similar using tikz matrix in the past, but I can't figure it out now. Any ideas? Also, what if I wanted to draw a ...

I'd like to make my subsubsection heading unbolded. Is there a simple way to do this?

I'm making a study guide for my students with several practice questions. I'm also working on a separate solution manual. Until now, I was using two separate documents. The problem is that if I rearrange the questions in the study guide, I have to sort through the solution manual and find the ...

Just a quick followup question:

When I use the label/reference with a nested list, as in:
\begin{enumerate}
\item Item
\begin{enumerate}[i]
\item\label{ite:fir} First subitem.
\item\label{ite:sec} Second subitem.
\item\label{ite:thi} Third subitem.
\end{enumerate}
\item Next item
\end{enumerate ...

When using pmatrix (or bmatrix), is there an easy way to make the elements of the matrix align to the right? It seems like the automatically center by default.

Thanks! That's exactly what I was looking for.

I have a question about referencing list items. I'm making a question sheet for my students. Some questions are phrased in the form "use the following information for questions 5, 6 and 7"

So, my latex code looks something like this:
\begin{enumerate}
\item Question one goes here
\item Question ...

I have three systems of equations that I'd like to display in a row as in question 1 in the pdf file that is attached.

Specifically, I'd like the systems of equations to be numbered and to appear in a row. Is there any easy way to do this? Thanks.

I stumbled on this post after searching through the forum. I'm experiencing the exact same situation. Does anyone have any ideas how to solve this? Thanks!