Introduction
摘要
In this introductory chapter I will first describe the modern concept of the virtual particle in a non-technical manner and secondly emphasise the role of analytical categories and modern-day conceptions in a historical study of conceptual development. I will synthesize a preliminary history of the virtual particle concept from the available literature in the third subsection. Inconsistencies in the secondary literature are revealed and guiding questions will be formulated. In the last section, an overview of the contents of this book is given and the chapters most interesting for specific groups of readers are indicated.