Fix

introduction.tex

@@ -247,7 +247,6 @@ input is e.m(e);
 \begin{recap}\textbf{TI for FGJ without Wildcards:}
 - usually the type of e must be subtypes of the method parameters
 - in case of a polymorphic method: type placeholders resemble type parameters
-\end{itemize}
 \end{recap}
 involving wildcards:
 - depending on the type of e a capture conversion must be applied first