Originated by the author in , the field of PT parity time symmetry has become an extremely active and exciting area of research PT symmetric quantum and classical systems have theoretical, experimental, and commercial applications, and have been the subject of many journal articles, PhD theses, conferences, and symposia Carl Bender s work has influenced major advances in physics and generations of students This book is an accessible entry point to PT symmetry, ideal for students and scientists looking to begin their own research projects in this field