1 files changed, 7 insertions, 0 deletions

diff --git a/tex/preamble.tex b/tex/preamble.tex
index a583a3b..8ff41d1 100644
--- a/tex/preamble.tex
+++ b/tex/preamble.tex
@@ -5,5 +5,12 @@
 \usepackage{amsmath}
 \usepackage{mathrsfs}
 
+\usepackage{tikz}
+
+\usetikzlibrary{cd}
+
 \newcommand*{\ca}[1]{\ensuremath{\mathbf{#1}}\xspace}
+\newcommand*{\idarr}[1]{\ensuremath{\mathrm{id}_{#1}}}
+
+\newcommand{\id}{\ensuremath{\mathrm{id}}}
 \renewcommand{\implies}{\rightarrow}