Important correction!

I did a mistake on the blackboard during the seminar lecture today (monday). As was noted, my solution to the second degree polynomial equation was a little bit strange, and in fact it was wrong.

Correction: in the formula for m_1 and m_2 from Case I inside the box, you should include 1/2 right after the +/- sign. By looking up the formula in Syds?ther et al. you will see the correct form if you prefer to verify.

This mistake does not have an effect on anything else lectured.

Espen