1 files changed, 1 insertions, 0 deletions
diff --git a/main.tex b/main.tex
index 428ae60..fb7e523 100644
--- a/main.tex
+++ b/main.tex
@@ -87,6 +87,7 @@
 \newcommand{\epicTo}{\twoheadrightarrow}
 \renewcommand{\mapsto}{\rightsquigarrow}
 \renewcommand{\Im}{\error{You probably meant \backslash{}Im}}
+\newcommand{\dual}[1]{#1^{\text{op}}}
 
 \begin{document}
 \begin{titlepage}