diff --git a/math_commands.tex b/math_commands.tex
index 0668f93..e8aa92f 100644
--- a/math_commands.tex
+++ b/math_commands.tex
@@ -1,6 +1,6 @@
 %%%%% NEW MATH DEFINITIONS %%%%%
 
-\usepackage{amsmath,amsfonts,bm}
+\usepackage{amsmath,amsfonts,bm,mathtools}
 
 % Mark sections of captions for referring to divisions of figures
 \newcommand{\figleft}{{\em (Left)}}
@@ -55,8 +55,8 @@
 \def\Partref#1{Part~\ref{#1}}
 \def\twopartref#1#2{parts \ref{#1} and \ref{#2}}
 
-\def\ceil#1{\lceil #1 \rceil}
-\def\floor#1{\lfloor #1 \rfloor}
+\DeclarePairedDelimiter{\ceil}{\lceil}{\rceil}
+\DeclarePairedDelimiter{\floor}{\lfloor}{\rfloor}
 \def\1{\bm{1}}
 \newcommand{\train}{\mathcal{D}}
 \newcommand{\valid}{\mathcal{D_{\mathrm{valid}}}}