1 files changed, 4 insertions, 1 deletions
diff --git a/main.tex b/main.tex
index 48731b1..428ae60 100644
--- a/main.tex
+++ b/main.tex
@@ -49,7 +49,8 @@
 \dCat{\bMon}{Mon}
 \dCat{\bGrp}{Grp}
 \dCat{\bAb}{Ab}
-\dCat{\bRing}{Ring}
+\dCat{\bRing}{Rng} % Backwards compat
+\dCat{\bRng}{Rng}
 \dCat{\bField}{Field}
 \dCat{\bMod}{Mod}
 \dCat{\bVec}{Vec}
@@ -73,6 +74,7 @@
 \dKeyPar{\Mor}{Mor}
 \dKey{\dom}{dom}
 \dKey{\cod}{cod}
+\dKey{\Img}{Im}
 \newcommand{\dStdSet}[2]{\newcommand{#1}{\mathbb{#2}}}
 \dStdSet{\sNat}{N}
 \dStdSet{\sInt}{Z}
@@ -84,6 +86,7 @@
 \newcommand{\monicTo}{\rightarrowtail}
 \newcommand{\epicTo}{\twoheadrightarrow}
 \renewcommand{\mapsto}{\rightsquigarrow}
+\renewcommand{\Im}{\error{You probably meant \backslash{}Im}}
 
 \begin{document}
 \begin{titlepage}