# How do I change the size of a matrix within a matrix?

I am trying to make the inner matrix the same size as the 0, i.e. the large matrix should have two equally sized components, a 0 and a small matrix (1,0).

Here is my MWE

\documentclass[amsmath,amssymb,12pt,eqsecnum]{revtex4}
\usepackage[a4paper]{geometry}
\usepackage{slashed}
\usepackage{gensymb}
\usepackage{simplewick}
\usepackage{feynmp-auto}
\usepackage[pdftex]{graphicx}
\begin{document}

\begin{pmatrix}
0 \\
{\begin{pmatrix}
1 \\ 0
\end{pmatrix}}
\end{pmatrix}
\end{document}

• Welcome to TeX.SX! – egreg Dec 24 '14 at 20:43

You can use smallmatrix:
\documentclass{article}
$\begin{pmatrix} 0 \\ \left(\begin{smallmatrix} 1 \\ 0 \end{smallmatrix}\right) \end{pmatrix}$

This doesn't require resources other than amsmath, so I made the example as short as possible.