The CRC Press Mathematics Handbooks collection includes many seminal works offered as a single reference to promote and establish the foundations of research and to promote new results. Editors and contributors with established research records offer their perspectives and results to create handbooks many mathematicians highly value. The value extends to those in other disciplines as well including engineering, physics, statistics, computer science, and the life sciences. Each handbook records the current state-of-the-art in research, and subsequent editions update research as new results require. We offer handbooks to better service the mathematics discipline, encourage young researchers, inform new results, and lay the foundations for further study.