diff --git a/math.tex b/math.tex
index 53d8d5a..46c12db 100644
--- a/math.tex
+++ b/math.tex
@@ -25,7 +25,9 @@
 \newcommand{\sign}{{\text{sign}}}
 
 \newcommand{\QED}{\begin{large}\textbf{\checkmark}\end{large}}
-\newcommand{\cequiv}{\stackrel{\scriptscriptstyle\wedge}{=}}
+\newcommand{\cequiv}{\stackrel{\scriptscriptstyle\wedge}{=}} %ContextEQUIvalent
+\newcommand{\deq}{\stackrel{!}{=}}
+\newcommand{\expval}[1]{\langle #1 \rangle}
 
 \newcommand{\diffP}[1]{\frac{\partial}{\partial #1}}
 \newcommand{\diffT}[1]{\frac{\text{d}}{\text{d} #1}}
@@ -37,6 +39,7 @@
 \newcommand{\integrinf}[2]{\int_{-\infty}^[\infty #1 \text{\,d}#2}
 
 \newcommand{\sbk}[1]{\left( #1 \right)}
+\newcommand{\sqbk}[1]{\left[ #q ]\right}
 
 \newcommand{\levicivita}[1]{\varepsilon_{#1}}
 \newcommand{\krondelta}[1]{\delta_{#1}}
\ No newline at end of file