diff --git a/semester4/dmdb/data-modelling-databases-summary.tex b/semester4/dmdb/data-modelling-databases-summary.tex
index e426f83..e46a528 100644
--- a/semester4/dmdb/data-modelling-databases-summary.tex
+++ b/semester4/dmdb/data-modelling-databases-summary.tex
@@ -19,10 +19,10 @@
 \vspace{2cm}
 \begin{center}
     \begin{Large}
-        \quote{A funny quote by a professor}
+        \quote{A curry can be written in many different ways}
     \end{Large}
 
-    \hspace{3cm} - Prof. Dr. Professor Name, YEAR
+    \hspace{3cm} - Prof. Dr. Gustavo Alonso, 2026
 \end{center}
 
 \vspace{1.5cm}
@@ -39,6 +39,10 @@
 \printtoc{Aquamarine}
 
 
+\section{Introduction}
+A note on the quote on the title page: He did not \textit{actually} mean ``curry'', but of course ``query'', but he just pronounced it that way.
+
+
 
 
 
diff --git a/semester4/ps/ps-jh/parts/01_random-variables/00_definition.tex b/semester4/ps/ps-jh/parts/01_random-variables/00_definition.tex
index 2ce76c4..2b27d5f 100644
--- a/semester4/ps/ps-jh/parts/01_random-variables/00_definition.tex
+++ b/semester4/ps/ps-jh/parts/01_random-variables/00_definition.tex
@@ -1 +1,8 @@
 \subsection{Abstrakte Definition}
+\shortdefinition[Zufallsvariable] kurz Z.V, ist $\cX : \Omega \rightarrow \R$, sodass $\forall a \in \R$ gilt:
+$f = \{ \omega \in \Omega \divider \cX(\omega) \leq a \} \in \cF$ (notwendinge Bedingung für Wohldefiniertheit von $\P[f]$)
+
+\inlinenotation Ohne $\omega$: $\{ X \leq a \} = \{ \omega \in \Omega \divider X(\omega) \leq a \}$, etc
+
+\subsection{Verteilungsfunktion}
+\shortdefinition $F_\cX : \R \rightarrow [0, 1]$, def: $\forall a \in \R \quad F_\cX(a) = \P[\cX \leq a]$
diff --git a/semester4/ps/ps-jh/probability-and-statistics-cheatsheet.pdf b/semester4/ps/ps-jh/probability-and-statistics-cheatsheet.pdf
index 4ab8a66..9c9652a 100644
Binary files a/semester4/ps/ps-jh/probability-and-statistics-cheatsheet.pdf and b/semester4/ps/ps-jh/probability-and-statistics-cheatsheet.pdf differ