diff --git a/Lectures_my/KT2_2017/ex1/header.tex b/Lectures_my/KT2_2017/ex1/header.tex
index 4d10cf8..0df90f3 100644
--- a/Lectures_my/KT2_2017/ex1/header.tex
+++ b/Lectures_my/KT2_2017/ex1/header.tex
@@ -81,13 +81,13 @@
 % Set the authors ect..
 %
 
-\newcommand{\thelecture}{Numerical Methods}
+\newcommand{\thelecture}{Kern- und Teilchenphysik II}
 \newcommand{\thelectureshort}{NM}
-\newcommand{\thelectureURL}{\url{ http://www.physik.uzh.ch/en/teaching/PHY233/HS2016.html}}
+\newcommand{\thelectureURL}{\url{ http://www.physik.uzh.ch/de/lehre/PHY213/FS2017.html}}
 \newcommand{\sheettype}{Exercise}
 \newcommand{\thesemester}{HS 16}
-\newcommand{\thelecturer}{M.~Chrzaszcz\\ D.~van~Dyk}
-\newcommand{\theassistants}{I.~Bezshyiko, A.~Pattori}
+\newcommand{\thelecturer}{Prof. Nicola Serra, \\Dr. Annapaola De Cosa}
+\newcommand{\theassistants}{Dr. Marcin Chrzaszcz}
 
 
 
diff --git a/Lectures_my/KT2_2017/ex1/sheet01.pdf b/Lectures_my/KT2_2017/ex1/sheet01.pdf
index 9450563..e600ae7 100644
--- a/Lectures_my/KT2_2017/ex1/sheet01.pdf
+++ b/Lectures_my/KT2_2017/ex1/sheet01.pdf
Binary files differ
diff --git a/Lectures_my/KT2_2017/ex1/sheet01.tex b/Lectures_my/KT2_2017/ex1/sheet01.tex
index cba2d21..83c608d 100644
--- a/Lectures_my/KT2_2017/ex1/sheet01.tex
+++ b/Lectures_my/KT2_2017/ex1/sheet01.tex
@@ -20,8 +20,9 @@
 \startsheet
 
 \setcounter{exercise}{0}
-\exercise[3]{Install the virtual machine}
+\exercise[3]{Conservation laws}
 
+One other quantum number that we did not discuss is Izospin. 
 
 To install a virtual Linux machine on Linux, MacOS and Windows, follow these steps:
 %