We thank the following for their helpful comments and corrections, as well as for catching typos: Zhenyu Cai, Jedrzej Burkat, Maryam Khaqan, Rolando Reiner, Jan Baltussen, Linus Kelsey, Edgardo Deza, Elizabeth Ealing, L.L. Salcedo, Giuseppe Bisicchia, Tom Scruby. We also appreciate the work of Yihui Xie in developing the Bookdown package with which this e-book was built.

The creation and hosting of the online book was made possible by the Centre for Quantum Technologies, the University of Oxford Mathematical Institute, and the Okinawa Institute of Science and Technology.