Mathematics is increasingly applied in a variety of professions and activities, which include biology, business management, economics, engineering, medicine, psychology and sociology. The aim of this Handbook is to provide up-to-date and easily accessible information about the practical aspects of all mathematics and it is specifically addressed to users of mathematics who are not professional mathematicians. The work is comprehensive in that all mathematical topics which are actually being used or are considered valuable for future development are covered in the work. During its development, great lengths have been taken, to ensure that no branch of mathematics is omitted which is useful and conversely that none is included which is not.