[Analysis] Add general notes

semester3/analysis-ii/cheat-sheet-jh/analysis-ii-cheat-sheet.tex

@@ -50,6 +50,7 @@
 
 
 \newpage
+\setcounter{section}{-1}
 \section{Introduction}
 This Cheat-Sheet does not serve as a replacement for solving exercises and getting familiar with the content.
 There is no guarantee that the content is 100\% accurate, so use at your own risk. 
@@ -68,12 +69,12 @@ And yes, she did really miss an opportunity there with the quote\dots But she wa
 This summary also uses tips and tricks from this \hlhref{https://polybox.ethz.ch/index.php/s/WBGFTRdEjRwJjQC}{Exercise Session}
 
 
-% TODO: Everywhere: Check with TA notes to add tips and tricks
-
 %          ╭────────────────────────────────────────────────╮
 %          │                    Content                     │
 %          ╰────────────────────────────────────────────────╯
 \newsection
+\input{parts/00_intro.tex}
+
 \section{Differential Equations}
 \input{parts/diffeq/00_intro.tex}
 \input{parts/diffeq/linear-ode/00_intro.tex}