How can I make the exponent on gamma in this picture? The best description I can come up with is a closed degree symbol.
[Tex/LaTex] A closed degree symbol
math-modesymbols
Related Solutions
MnSymbol package has \invneg symbol, which is most likely what you're looking for. Hope this helps.
\documentclass{article}
\usepackage{mnsymbol}
\begin{document}
\[\invneg\]
\end{document}
Here's an example redefining the internal macro \r@@t of latex.ltx:
\documentclass{article}
\usepackage{letltxmacro}
\makeatletter
\let\oldr@@t\r@@t
\def\r@@t#1#2{%
\setbox0=\hbox{$\oldr@@t#1{#2\,}$}\dimen0=\ht0
\advance\dimen0-0.2\ht0
\setbox2=\hbox{\vrule height\ht0 depth -\dimen0}%
{\box0\lower0.4pt\box2}}
\LetLtxMacro{\oldsqrt}{\sqrt}
\renewcommand*{\sqrt}[2][\ ]{\oldsqrt[#1]{#2}}
\makeatother
\begin{document}
\[ \sqrt[3]{\frac{a}{b}} \quad \sqrt{\frac{a}{b}} \]
\end{document}
Edit: \LetLtxMacro{\oldsqrt}{\sqrt} instead of \let\oldsqrt\sqrt because \sqrt takes an optional argument (as advised by egreg)
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Best Answer
Have a look at “How to look up a math symbol?” for ideas how you can easily find a particular symbol.