Preface

All good things come to an end, also my time as a student at the university. First, I would like to thank my supervisor, professor Magne S. Espedal, for always being enthusiastic, positive and willing to help. Sylvie Schuller de-serves thanks for constructive feedback when it comes to geology and Dmitriy Kolyukhin must be mentioned for letting me use his code and for interesting discussions. To all the others who have contributed in my thesis, thank you! I would also express my gratitude to the present and former students at the Department of Mathematics for a good and friendly atmosphere. Among them, I would like to emphasize Jørn Hafver for many inspiring conversa-tions and unforgettable memories throughout the years as students at the university. Finally, I would like to thank my family. Especially, my mother and fa-ther for always believing in me and for all great support you have given me. I am grateful for having such fabulous parents