--- a/ChengsongTanPhdThesis/Chapters/Introduction.tex	Mon Aug 15 17:26:08 2022 +0200
+++ b/ChengsongTanPhdThesis/Chapters/Introduction.tex	Wed Aug 17 01:09:13 2022 +0100
@@ -132,6 +132,13 @@
 \def\flts{\textit{flts}}
 
 
+\def\zeroable{\textit{zeroable}}
+\def\nub{\textit{nub}}
+\def\filter{\textit{filter}}
+\def\not{\textit{not}}
+
+
+
 \def\RZERO{\mathbf{0}_r }
 \def\RONE{\mathbf{1}_r}
 \newcommand\RCHAR[1]{\mathbf{#1}_r}