corrected indices in solution05.tex

tutorial-4/solution04.tex

@@ -176,7 +176,7 @@ Consider an electricity market with two generator types, one with variable cost
 
  The optimisation problem has objective function:
  \begin{equation*}
-  \max_{Q,Q_1,Q_2}\left[ U(Q) - C_1(Q_1) - C_2(Q_2) \right] =     \max_{Q,Q_1,Q_2} \left[8000Q-5Q^2 - c_2Q_1 - c_2Q_2 \right]
+  \max_{Q,Q_1,Q_2}\left[ U(Q) - C_1(Q_1) - C_2(Q_2) \right] =     \max_{Q,Q_1,Q_2} \left[8000Q-5Q^2 - c_1Q_1 - c_2Q_2 \right]
  \end{equation*}
  with constraints:
  \begin{align*}