Add more questions

VL2/content/VL2_questions_for_you.tex

@@ -3,7 +3,17 @@
 \item what is the difference between \hinline{foldr} and \hinline{foldl}?
 \item what is the difference between explicit and implicit recursion? Give examples
 \item how many arguments does a haskell function have (strictly speaking)?
+\item Are these type signatures technically equivalent?
+\begin{haskellcode}
+f :: Int -> Int -> Char -> Int -> Int -> Char
+f :: Int -> Int -> (Char -> (Int -> (Int -> Char)))
+\end{haskellcode}
+% $
 \item what do you have to keep in mind in order to make function composition work?
 \item can you define \hinline{map} and \hinline{filter} in terms of \hinline{foldr}?
-\item what is eta reduction (or: eta abstraction)?
+\item simplify (and eta reduce) the following code snippet
+\begin{haskellcode}
+f x y = (\d e -> d * e) x $ y
+\end{haskellcode}
+% $
 \end{itemize}