To My Family
Thanks to my dear wife, Katrin, and our lovely
children, Stian, Mia, and Magnus, for their love,
support, and patience. I am a very lucky man.
To Hans Petter
Dear friend and coauthor, it is so sad you are no
longer among us. 1 Thank you for everything. I
dedicate this second edition of our book to you.
Porsgrunn, Norway
Svein Linge
June 2018
1 Professor Hans Petter Langtangen (https://en.wikipedia.org/wiki/Hans_Petter_Langtangen)
passed away with cancer on the 10th of October, 2016.