--- a/ChengsongTanPhdThesis/Chapters/Introduction.tex	Tue Jul 05 00:42:06 2022 +0100
+++ b/ChengsongTanPhdThesis/Chapters/Introduction.tex	Wed Jul 13 08:27:28 2022 +0100
@@ -21,6 +21,7 @@
 \newcommand{\ASEQ}[3]{\textit{ASEQ}_{#1} \, #2 \, #3}
 \newcommand{\bderssimp}[2]{#1 \backslash_{bsimps} #2}
 \newcommand{\rderssimp}[2]{#1 \backslash_{rsimp} #2}
+\def\derssimp{\textit{ders}\_\textit{simp}}
 \def\rders{\textit{rders}}
 \newcommand{\bders}[2]{#1 \backslash #2}
 \newcommand{\bsimp}[1]{\textit{bsimp}(#1)}
@@ -39,6 +40,7 @@
 
 \newcommand\myequiv{\mathrel{\stackrel{\makebox[0pt]{\mbox{\normalfont\tiny equiv}}}{=}}}
 
+\def\case{\textit{case}}
 \def\sequal{\stackrel{\mbox{\scriptsize rsimp}}{=}}
 \def\rsimpalts{\textit{rsimp}_{ALTS}}
 \def\good{\textit{good}}
@@ -82,7 +84,7 @@
 \def\blexer{\textit{blexer}}
 \def\flex{\textit{flex}}
 \def\inj{\mathit{inj}}
-\def\Empty{\mathit{Empty}}
+\def\Empty{\textit{Empty}}
 \def\Left{\mathit{Left}}
 \def\Right{\mathit{Right}}
 \def\Stars{\mathit{Stars}}