How to get larger $\forall$ symbol? Adding \Big$ doesn't work.
[Tex/LaTex] Large $\forall$
math-modesymbols
Related Solutions
This is what I can offer for a \bigperp command:
\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}
\makeatletter
\newcommand{\bigperp}{%
\mathop{\mathpalette\bigp@rp\relax}%
\displaylimits
}
\newcommand{\bigp@rp}[2]{%
\vcenter{
\m@th\hbox{\scalebox{\ifx#1\displaystyle2.1\else1.5\fi}{$#1\perp$}}
}%
}
\makeatother
\begin{document}
$
\displaystyle\bigperp\sum
\textstyle\bigperp\sum
\scriptstyle\bigperp\sum
\scriptscriptstyle\bigperp\sum
$
$\displaystyle\bigperp_{i=1}^{n} U_{i}$
\end{document}
I understand it's only an example, but your usage of \left and \right is wrong.
\begin{align}
something &\biggl(\sum_{n}\nonumber\\
&\quad+y\biggr) \bigg/ x^2.
\end{align}
Best Answer
This is the most modest increment on Seamus' and Martin Scharrer's comments above: if you use it more than once, you may as well go ahead and define
\newcommand\bigforall{\mbox{\Large $\mathsurround0pt\forall$}}which will co-operate with the mathmode context you will likely be using the symbol in.