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That's what I am looking to enter

To make things easy, I have put up a pic here, I do not understand how I can reduce the size of the long entries in the matrix (the diagonal entries primarily) and also introduce line breaks so as to print a matrix similar to this one here.

Any help will be much appreciated. Thanks and regards, Florian

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    welcome to tex.sx, It always helps if you post a complete small document showing the problem, If you provided a matrix with that data, someone could show you how to reformat it. Sep 12, 2013 at 21:13

1 Answer 1

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Environment smallmatrix of package amsmath provides a matrix with smaller fonts and manual line breaks, e.g.:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\[
  \mathbf{A}^{-1} = \frac{1}{\alpha}
  \begin{pmatrix}
    \begin{smallmatrix}
      \lambda_c \lambda_m \lambda_s + \lambda_m \lambda_s + {} \\
      E^2 \lambda_c \lambda_s + E_y^2 \lambda_c \lambda_m
    \end{smallmatrix} &
    -E_x E_y \lambda_c \lambda_m &
    E_x E \lambda_c \lambda_s &
    E_x \lambda_m \lambda_s
    \\
    -E_x E_y \lambda_c \lambda_m &
    \begin{smallmatrix}
      \lambda_c \lambda_m \lambda_s + \lambda_m \lambda_s + {} \\
      E^2 \lambda_c \lambda_s + E_z^2 \lambda_c \lambda_m
    \end{smallmatrix} &
    E_y E \lambda_c \lambda_s &
    E_y \lambda_m \lambda_s
    \\
    E_x E \lambda_c \lambda_s &
    E_y E \lambda_c \lambda_s &
    \begin{smallmatrix}
      \lambda_s^2 + {} \\
      (E_z^2 + E_y^2 + \lambda_s) \lambda_c \lambda_s
    \end{smallmatrix} &
    -E \lambda_s^2
    \\
    E_x \lambda_m \lambda_s &
    E_y \lambda_m \lambda_s &
    -E \lambda_s^2 &
    \begin{smallmatrix}
      E^2 \lambda_s^2 + {} \\
      (E_x^2 + E_y^2 + \lambda_s) \lambda_m \lambda_s
    \end{smallmatrix}
  \end{pmatrix}
\]
\end{document}

Result

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    +1 for the effort of typing all that in without a supplied example:-) Sep 12, 2013 at 21:40

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