diff --git a/src/math/faktor.pysty b/src/math/faktor.pysty
index 81b3a6a..2f450a4 100644
--- a/src/math/faktor.pysty
+++ b/src/math/faktor.pysty
@@ -18,26 +18,26 @@ __HEADER__(Faktor package that also handles cofaktors)
 \RequirePackage{mathtools}
 
 
-\DeclareDocumentCommand{\faktor}{s m O{0.5} m O{-0.5}}{% \newfaktor[*]{#2}[#3]{#4}[#5] -> #2/#4
-  \setbox0=\hbox{\ensuremath{#2}}% Store numerator
+\DeclareDocumentCommand{\faktor}{s O{0.5} m O{-0.5} m}{% \newfaktor[*][#2]{#3}[#4]{#5} -> #3/#5
+  \setbox0=\hbox{\ensuremath{#3}}% Store numerator
   \setbox1=\hbox{\ensuremath{\diagup}}% Store slash /
-  \setbox2=\hbox{\ensuremath{#4}}% Store denominator
-  \raisebox{#3\ht1}{\usebox0}% Numerator
+  \setbox2=\hbox{\ensuremath{#5}}% Store denominator
+  \raisebox{#2\ht1}{\usebox0}% Numerator
   \mkern-5mu\ifthenelse{\equal{#1}{\BooleanTrue}}% Slash /
     {\diagup}% regular \faktor slash
-    {\rotatebox{-44}{\rule[#5\ht2]{0.4pt}{-#5\ht2+#3\ht0+\ht0}}}% tilted rule as a slash
+    {\rotatebox{-44}{\rule[#4\ht2]{0.4pt}{-#4\ht2+#2\ht0+\ht0}}}% tilted rule as a slash
   \mkern-4mu%
-  \raisebox{#5\ht2}{\usebox2}% Denominator
+  \raisebox{#4\ht2}{\usebox2}% Denominator
 }
 
-\DeclareDocumentCommand{\cofaktor}{s m O{-0.5} m O{0.5}}{% \newfaktor[*]{#2}[#3]{#4}[#5] -> #2/#4
-  \setbox0=\hbox{\ensuremath{#2}}% Store numerator
+\DeclareDocumentCommand{\cofaktor}{s m O{-0.5} m O{0.5}}{% \newfaktor[*][#2]{#3}[#4]{#5} -> #2\#4
+  \setbox0=\hbox{\ensuremath{#3}}% Store numerator
   \setbox1=\hbox{\ensuremath{\diagdown}}% Store slash /
-  \setbox2=\hbox{\ensuremath{#4}}% Store denominator
-  \raisebox{#3\ht1}{\usebox0}% Numerator
+  \setbox2=\hbox{\ensuremath{#5}}% Store denominator
+  \raisebox{#2\ht1}{\usebox0}% Numerator
   \mkern-5mu\ifthenelse{\equal{#1}{\BooleanTrue}}% Slash /
     {\diagdown}% regular \faktor slash
-    {\rotatebox{44}{\rule[-#5\ht2]{0.4pt}{#5\ht2-#3\ht0+\ht0}}}% tilted rule as a slash
+    {\rotatebox{44}{\rule[-#4\ht2]{0.4pt}{#4\ht2-#2\ht0+\ht0}}}% tilted rule as a slash
   \mkern-4mu%
-  \raisebox{#5\ht2}{\usebox2}% Denominator
+  \raisebox{#4\ht2}{\usebox2}% Denominator
 }
diff --git a/tests/math/faktor/test.tex b/tests/math/faktor/test.tex
index b2deb2b..3191431 100644
--- a/tests/math/faktor/test.tex
+++ b/tests/math/faktor/test.tex
@@ -5,12 +5,12 @@
 \begin{document}
 
 \[
-    \faktor{A}{B} \cong \cofaktor{A}{B}
+    \faktor{A}{B} \cong \cofaktor{C}{D}
 \] 
 \[
-    \faktor{A}[1]{B}[-1.5] \cong \cofaktor{A}[-1]{B}[0.5]
+   \faktor[1]{A}[-1.5]{B} \cong \cofaktor[-1]{A}[0.5]{B}
 \] 
 \[
-    \cofaktor*{A}[-1]{B}[2]  = x
+  \cofaktor*[-1]{A}[2]{B}  = x
 \]
 \end{document}
diff --git a/tests/wip/exercises/test.toc b/tests/wip/exercises/test.toc
deleted file mode 100644
index ac51e5c..0000000
--- a/tests/wip/exercises/test.toc
+++ /dev/null
@@ -1,3 +0,0 @@
-\contentsline {section}{\numberline {1}test}{1}{section.1}%
-\contentsline {subsection}{1. Exercise Sheet}{1}{section*.2}%
-\contentsline {subsection}{2. Exercise Sheet}{1}{section*.3}%