This book highlights the mathematical and physical properties of
acoustical sources with singularities located in the complex plane and
presents the application of such special elements to solve acoustical
radiation and scattering problems.
Sources whose origin lies in the complex plane are also solutions of the
wave equation but possess different radiating properties as their
counterparts with real positions. Such mathematical constructions are
known in the fields of optics and electrodynamics, but they are not
common in acoustical research. The objective of the book is to introduce
this concept to acousticians and motivate them to engage themselves in
further research and application of complex sources. Such sources are
particularly useful to formulate Green's functions and related
equivalent source and boundary element methods in half-spaces.