Special functions enable us to formulate a scientific problem by reduction such that a new, more concrete problem can be attacked within a well-structured framework, usually in the context of differential equations. A good understanding of special functions provides the capacity to recognize the causality between the abstractness of the mathematical concept and both the impact on and cross-sectional importance to the scientific reality.The special functions to be discussed in this monograph vary greatly, depending on the measurement parameters examined (gravitation, electric and magnetic fields, deformation, climate observables, fluid flow, etc.) and on the respective field characteristic (potential field, diffusion field, wave field). The differential equation under consideration determines the type of special functions that are needed in the desired reduction process.Each chapter closes with exercises that reflect significant topics, mostly in computational applications. As a result, readers are not only directly confronted with the specific contents of each chapter, but also with additional knowledge on mathematical fields of research, where special functions are essential to application. All in all, the book is an equally valuable resource for education in geomathematics and the study of applied and harmonic analysis.Students who wish to continue with further studies should consult the literature given as supplements for each topic covered in the exercises.

Willi Freeden: Studies in mathematics, geography, and philosophy at the RWTH Aachen, 1971 Diplom in mathematics, 1972 Staatsexamen in mathematics and geography, 1975 PhD in mathematics, 1979 Habilitation in mathematics, 1981/1982 visiting research professor at The Ohio State University, Columbus (Department of Geodetic Science and Surveying), 1984 professor of mathematics at the RWTH Aachen (Institute of Pure and Applied Mathematics), 1989 professor of technomathematics (industrial mathematics), 1994 head of the Geomathematics Group, 20022006 vice-president for Research and Technology at the University of Kaiserslautern, 2009 editor in chief of the International Journal on Geomathematics (GEM), 2010 editor of the Handbook of Geomathematics, member of the editorial board of seven international journals.

Martin Gutting: Studies in mathematics at the University of Kaiserslautern, 2003 Diplom in mathematics, focus on geomathematics , 2007 PhD in mathematics, postdoc researcherat the University of Kaiserslautern, lecturer in the course of geomathematics (in particular for constructive approximation, special functions, and inverse problems), 2011 lecturer for engineering mathematics at the University of Kaiserslautern and DHBW Mannheim.

1 Introduction: Geomathematical Motivation.- Part I: Auxiliary Functions.- 2 The Gamma Function.- 3 Orthogonal Polynomials.- Part II: Spherically Oriented Functions.- 4 Scalar Spherical Harmonics in R^3.- 5 Vectorial Spherical Harmonics in R^3.- 6 Spherical Harmonics in R^q.- 7 Classical Bessel Functions.- 8 Bessel Functions in R^q.- Part III: Periodically Oriented Functions.- 9 Lattice Functions in R.- 10 Lattice Functions in R^q.- 11 Concluding Remarks.- References.- Index.