Abstract:I am grateful to the members of the committee for agreeing to evaluate my thesis, in particular, to Prof. Tatyana Krivobokova for taking up the duty of Korreferentin.I find myself lucky to have colleagues at the IMS. I think that the institute is a friendly, supportive and an inspiring place to work.A big thanks goes to my office mates: Florian Pein, Marco Seiler and Miguel del Álamo Ruiz for helping me with various (non)mathematical issues. Especially when I started and when I was sick. I would like to thank … Show more
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