# Increase font size and making a boldface in mathmode in Latex

How to increase the font size and make a boldface of the whole symbol given above in mathmode in Latex ?

• The whole thing? Or just \sigma? And which part do you want to increase the font size of? Please be more specific... – Werner Nov 26 '13 at 6:21
• Would this help? tex.stackexchange.com/q/595/34618 – Jesse Nov 26 '13 at 6:27
• @Werner I need for the whole thing. Edited my question. – Suman Nov 26 '13 at 6:30

Using \bm command from bm package and \scalebox from graphicx package.

Code:

\documentclass{article}
\usepackage{bm,graphicx}

\begin{document}
\centering

Normal
$\sigma_{E_{1}}^{(l)}$

\bigskip

Bold
$\bm{\sigma_{E_{1}}^{(l)}}$

\bigskip

Bold and bigger
$\scalebox{2}{\ensuremath{\bm{\sigma_{E_{1}}^{(l)}}}}$

\end{document}

The latter can be used outside math mode, as well. Adjust the factor 2 to meet your needs.

Another alternative without 'scalebox'.

Code

\documentclass{article}
\usepackage{amsmath,bm}
\begin{document}

Normal
$\sigma^{(l)}_{E_1}$

Bold and Huge size
$\Huge \bm{ \sigma^{(l)}_{E_1}}$

Bold and scripsize
$\scriptsize \bm{ \sigma^{(l)}_{E_1}}$
\end{document}