ACKNOWLEDGEMENTS xiii Warning: We generally use and L2 interchangeably, and the same goes for expressions like “orthogonality of parameters” and “pseudo-orthogonality of parameters”. Acknowledgements This monograph is an outgrowth of the notes for a series of CBMS lectures that I presented at Kansas State University, Manhattan, Kansas, in June 2013. I am very grateful to Diego Maldonado and Virginia Naibo for organizing and running the conference and for their warm hospitality in Manhattan. I am also very grateful to all the participants for their interest and encouragement. The material presented in this monograph is the product of a long and ongoing collaboration with Frank Merle and with Thomas Duyckaerts and Frank Merle, whom I would like to thank most warmly for all the joint work and for the many hours of mathematical discussions.
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