1 files changed, 6 insertions, 1 deletions
diff --git a/SigSys.tex b/SigSys.tex
index 192a703..2384aa7 100644
--- a/SigSys.tex
+++ b/SigSys.tex
@@ -52,7 +52,12 @@
 % Document
 
 \DeclareMathOperator{\fourier}{\mathcal{F}}
+\DeclareMathOperator{\laplace}{\mathcal{L}}
+
 \DeclareMathOperator{\rank}{\mathrm{rank}}
+\DeclareMathOperator{\tr}{\mathrm{tr}}
+
+\DeclareMathOperator{\arccosh}{\mathrm{arccosh}}
 
 \begin{document}
 
@@ -70,12 +75,12 @@
 \part{Signals and Systems}
 \input{tex/signals}
 \input{tex/lti}
-\input{tex/lti-freq}
 \input{tex/state-space}
 \input{tex/filters}
 
 \part{Mathematics}
 % linear algebra
 % fourier and laplace transforms
+% signal flow diagrams
 
 \end{document}