About Book
These notes are based on lectures delivered at the University of Hamburg in the summerterm 2016. I would like to thank Birgit Richter for making her notes available to me. Thepresent notes are indeed just a minor extension of the notes for her course. I am grateful to S.Azzali, F. Bartelmann, S. Bunk, V. Koppen, A. Lahtinen, M. Manjunatha, L. Wienke and L.Woike for helpful comments.
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