How can you increase the size of \sigmaso that it would increase in size like o would become an O here (like a capital letter)? Preferably this would work when calling \sigma straight away without showing the small sign alltogether.
EDIT: I am looking to make the lower case greek sigma an upper case letter. I am not looking for a sum sign.
I have tried \renewcommand{\sigma}{\scalebox{2}{$\sigma$}} but it didn't work. It says sigma already defined.
It's hard to understand a reason for using the name \sigma for the big variant.
Anyway, here it is:
\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}
\let\originalsigma\sigma
\makeatletter
\DeclareRobustCommand{\sigma}{\mathord{\mathpalette\sigma@\relax}}
\newcommand{\sigma@}[2]{%
\begingroup
\sbox\z@{$#1O$}%
\resizebox{!}{\ht\z@}{$\m@th#1\originalsigma$}%
\endgroup
}
\makeatother
\begin{document}
[
O+\sigma+e^{\sigma t}
]
\end{document}
\scalebox{2}{$\sigma$}
You can change the value {2} if you need it to be larger. Please let me know if that is what you are looking for.
\renewcommand{\sigma}{\scalebox{2}{$\sigma$}} but it didn't work.
– Clone
May 28 '21 at 06:51
\let\ssigma\sigma \renewcommand{\sigma}{\scalebox{2}{$\ssigma$}} in preamble.
– Clone
May 28 '21 at 07:02
e^{\sigma t}as sigma remain big and does not become smaller as the t.
– Clone
May 28 '21 at 07:47
\sigmaoutputs the lowercase greek letter sigma (which is σ). Are you looking for a capital sigma (which is Σ)? Or for a lowercase sigma in a bigger font size? Or simply a similar symbol which would have the size of a capital O? – Vincent May 27 '21 at 17:47\sum) which grows larger in\displaystylemath? – Steven B. Segletes May 27 '21 at 17:54