[hackers] [libzahl] Fix difficulty ratings on exercises || Mattias Andrée

[git]

commit d11d27b4b13788a4172f46d19c40395fcca865c2
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Thu Jul 28 15:03:33 2016 +0200
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Thu Jul 28 15:03:33 2016 +0200

    Fix difficulty ratings on exercises
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/doc/exercises.tex b/doc/exercises.tex
index 83b79f8..757788b 100644
--- a/doc/exercises.tex
+++ b/doc/exercises.tex
@@ -8,6 +8,9 @@
 % ▶   Recommended
 % M   Matematically oriented
 % HM  Higher matematical education required
+% MP  Matematical problem solving skills required,
+%     double the rating otherwise; difficult is
+%     very personal
 % 
 % 00  Immediate
 % 10  Simple
@@ -46,7 +49,7 @@ with \texttt{zmod}?
 
 
 
-\item {[\textit{M10}]} \textbf{Convergence of the Lucas Number ratios}
+\item {[\textit{M15}]} \textbf{Convergence of the Lucas Number ratios}
 
 Find an approximation for
 $\displaystyle{ \lim_{n \to \infty} \frac{L_{n + 1}}{L_n}}$,
@@ -63,7 +66,7 @@ Lucas Number \psecref{sec:Lucas numbers}.
 
 
 
-\item {[\textit{M12${}^+$}]} \textbf{Factorisation of factorials}
+\item {[\textit{MP12}]} \textbf{Factorisation of factorials}
 
 Implement the function
 
@@ -105,7 +108,7 @@ $P_i$ is \texttt{P[i - 1]} and $K_i$ is \texttt{K[i - 1]}.
 
 
 
-\item {[$\RHD$\textit{M17}]} \textbf{Factorials inverted}
+\item {[$\RHD$\textit{MP17}]} \textbf{Factorials inverted}
 
 Implement the function