5

I'm having trouble aligning the parentheses of a matrix assembly (parentheses within the same matrix). Essentially, what I want to do is this (excuse the terrible paint-job):

enter image description here

Where the submatrix K1 and K2 overlap. K1 and K2, should be 6x6, and therefore the assembly is a 9x9 matrix. I'm primarily familiar with the array environment: is this a possibility there?

8

Some ideas: make 3 by 3 matrices, with large entries; in appropriate spots put smashed the matrices K1 and K2

\documentclass{article}
\usepackage{mathtools,delarray}

\newcommand{\lK}[1]{%
  \text{\LARGE$K^{#1}$}%
}
\newcommand{\plK}{\phantom{\lK{1}}}

\begin{document}

\[
\begin{bmatrix}
\mathrlap{\smash[b]{%
  \begin{array}[t]\lbrack{@{}ccc@{}}\rbrack
  \plK&\plK&\plK\\[3ex]
  \plK&
              \lK{1}&
  \plK\\[3ex]
  \plK&\plK&\plK
  \end{array}
}}
  \plK&\plK&\plK&\plK&\plK\\[2ex]
  \plK&\plK&\plK&\plK&\plK\\[2ex]
  \plK&\plK&\plK&\plK&\plK
\mathllap{\smash[b]{%
  \begin{array}[t]\lbrack{@{}ccc@{}}\rbrack
  \plK&\plK&\plK\\[3ex]
  \plK&
              \lK{2}&
  \plK\\[3ex]
  \plK&\plK&\plK
  \end{array}
}}\\[2ex]
  \plK&\plK&\plK&\plK&\plK\\[2ex]
  \plK&\plK&\plK&\plK&\plK\\[2ex]
\end{bmatrix}
\]
\end{document}

enter image description here

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