--- a/ChengsongTanPhdThesis/main.tex	Sat May 28 17:17:18 2022 +0100
+++ b/ChengsongTanPhdThesis/main.tex	Mon May 30 14:41:09 2022 +0100
@@ -264,6 +264,7 @@
 
 \newtheorem{theorem}{Theorem}
 \newtheorem{lemma}{Lemma}
+\newtheorem{definition}{Definition}
 %proof
 
 
@@ -334,17 +335,17 @@
 %	SYMBOLS
 %----------------------------------------------------------------------------------------
 
-\begin{symbols}{lll} % Include a list of Symbols (a three column table)
+%\begin{symbols}{lll} % Include a list of Symbols (a three column table)
 
-$a$ & distance & \si{\meter} \\
-$P$ & power & \si{\watt} (\si{\joule\per\second}) \\
+%$a$ & distance & \si{\meter} \\
+%$P$ & power & \si{\watt} (\si{\joule\per\second}) \\
 %Symbol & Name & Unit \\
 
-\addlinespace % Gap to separate the Roman symbols from the Greek
+%\addlinespace % Gap to separate the Roman symbols from the Greek
 
-$\omega$ & angular frequency & \si{\radian} \\
+%$\omega$ & angular frequency & \si{\radian} \\
 
-\end{symbols}
+%\end{symbols}
 
 %----------------------------------------------------------------------------------------
 %	DEDICATION