symbols
I'm trying to typeset an equation that contains the following:
\begin{align*}
\hat{\E[(R_{i}-\hat R_{i})^{2}]}
\end{align*}
However, this is what I get
Is this a bug? Is there any way around it? I'd like the "hat" to be over the whole expression, not just the expectation operator which I've defined as:
\newcommand{\E}{\mathbb{E}}
Edit: Following TH's advice, this would be a better command to use:
\newcommand{\trel}{\mathrel{\mathsurround=0pt \mbox{\raisebox{1.2pt}{\tiny \textbf{\textbar }}$\rhd$}}}
(I decided to explicitly say \mathsurround=0pt rather than just calling \m@th because that way, if Mike wants to paste this into the top of his document, he won't have to call \makeatletter)
Original: I don't know what built-in symbols would correspond to the one you're describing, but if you're just trying to get something done you could use this:
\newcommand{\trel}{\mbox{\raisebox{1.2pt}{\tiny \bf \textbar }$\rhd$}}
(and then use \trel every time you want to use this relation).
It's a huge hack, but, like I said, it might be enough to get you by.
Adapting egreg's solution:
\documentclass{article}
\usepackage{graphicx}
\newcommand\subsetsim{\mathrel{%
\ooalign{\raise0.2ex\hbox{$\subset$}\cr\hidewidth\raise-0.8ex\hbox{\scalebox{0.9}{$\sim$}}\hidewidth\cr}}}
\begin{document}
\[
A \subsetsim B
\]
\end{document}
Adapt the parameters to your likings.
Best Answer
You have to use
or if you want a bigger hat see this question.