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How can I adjust the size of subscripts showing dimension of these matrices in following code.

Is there anything other than \tiny{.} that can be used for this purpose?

\documentclass{beamer}
\usepackage{amsmath}
\newcommand*{\vertbar}{\rule[1ex]{0.5pt}{2.5ex}}
\newcommand*{\horzbar}{\rule[.5ex]{2.5ex}{0.5pt}}

\begin{document}

\begin{frame}
\begin{align*}
\boldsymbol{A} =
\left[
  \begin{array}{ccc}
    \horzbar & \boldsymbol{a}_{1}^{\tiny{T}} & \horzbar\\
    \horzbar & \boldsymbol{a}_{2}^{\tiny{T}} & \horzbar\\
    & \vdots & \\
    \horzbar & \boldsymbol{a}_{k_1}^{\tiny{T}} & \horzbar
  \end{array}
\right]_{\tiny{ k_1 \times k_2}}\implies
vec (\boldsymbol{A}) = 
  \left[
  \begin{matrix}
   \boldsymbol{a}_{1}^{\tiny{T}}   & \boldsymbol{a}_{2}^{\tiny{T}}       & \cdots   & \boldsymbol{a}_{k_1}^{\tiny{T}}     
\end{matrix}
\right]_{\tiny{k_1 k_2 \times 1}}^T
\end{align*}
\end{frame}
\end{document}
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  • Your \tiny commands do nothing, except filling your log file with warnings Command \tiny invalid in math mode. What adjustment would you like? – egreg Aug 17 '15 at 19:58
  • Oh...so what should I use to make 'T' (transpose operator) small? Actually I wanted to get reduce the space between end of matrix A and implies sign. I thought that making dimension font small will do the job. – NAASI Aug 17 '15 at 20:18
  • It is already smaller. – egreg Aug 17 '15 at 20:20
  • 1
    You might be interested in tex.stackexchange.com/questions/30619/… – John Kormylo Aug 17 '15 at 22:11
  • Also, \tiny doesn't take an argument even when it is used correctly in text mode. It is a font switch. Try putting \tiny{hello} world to see what I mean. – cfr Aug 17 '15 at 23:19

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