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I am trying to TeX the following schematic:

enter image description here

using some fiddling around with multirows. However, everything's messed up, so I suppose there must be a more elegant way. How? So far, my attempts using blkarray also do not work out quite well…

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Here is a proposal using a combination of array and matrix. I've reduced the vertical space between lines using, for example, [-1.3em]. Also reduced the space between the contents and large outside brackets using \mkern-8mu, for example. You can change these numbers as you see fit. Adjustments to the column separation can be made using \arraycolsep.

enter image description here

\documentclass[12pt,a4paper]{article}
\usepackage{mathtools}

\begin{document}

\[ \arraycolsep=3pt
\left(\mkern-8mu 
\begin{array}{cccc}
& & & \begin{matrix} a\\b \end{matrix} \\[-1.3em]
& & \left( \begin{matrix} e\\f \end{matrix} \middle/ \begin{matrix} c\\d \end{matrix} \right) & \\[-1em]
& g & & \\[-1.3em]
\left( \begin{matrix} j\\k \end{matrix} \middle/ \begin{matrix} h\\i \end{matrix} \right) & & &
\end{array}
\mkern-3mu\right)
\]

\end{document}
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  • This is really cool! I think it is even a bit handier if one puts the lonesome $g$ into a dummy matrix. Did you get the 1.3em just by trying, or is there a deeper reason? – Bubaya Jul 25 '18 at 10:51
  • No deep reason. I started off by putting [-1em] after each line break. And just adjusted them from there. – Milo Jul 25 '18 at 11:07
  • By the way, I'm curious, what does the word solidusses mean?? – Milo Jul 25 '18 at 11:09
  • Unicode uses the name solidus it to refer to a slash. Since I am unaware of Latin, I do not know the proper plural form. ~~Solidūs?~~ Solidi, according to Wikipedia – Bubaya Jul 25 '18 at 12:33

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