Acknowledgements

We would like to express our sincere gratitude to the many members of the community who have offered valuable feedback and helped us identify errata. In particular, we thank the following individuals, listed in alphabetical order: Francis Bach, Ilia Badanin, Rwiddhi Chakraborty, Mauricio Delbracio, Jacob Lessing, Kaiming He, Yutong (Kelly) He, Durk Kingma, Shucheng Li, Ramtin Moslemi, Rukmangadh Sai Myana, Stefano Peluchetti, Yuri Plotkin, François Rozet, Yair Shenfeld, Molei Tao, Mohamad Ternanni, and Baojian Zhou, as well as anonymous reviewers and other readers who kindly shared feedback.

The authors would also like to express their deep gratitude to Professor Dohyun Kwon from the University of Seoul and KIAS for his generous time and effort in engaging with this work. He carefully reviewed parts of Chapter 7, helping to ensure the correctness of statements and proofs, and contributed to several valuable discussions that clarified the presentation. Beyond his technical suggestions, his thoughtful feedback and willingness to share his perspectives have been a source of encouragement throughout the writing of this book. We sincerely appreciate his support and collegial spirit, which have enriched the final version.