Integral transforms are among the main mathematical methods for the
solution of equations describing physical systems, because, quite
generally, the coupling between the elements which constitute such a
system-these can be the mass points in a finite spring lattice or the
continuum of a diffusive or elastic medium-prevents a straightforward
"single-particle" solution. By describing the same system in an
appropriate reference frame, one can often bring about a mathematical
uncoupling of the equations in such a way that the solution becomes that
of noninteracting constituents. The "tilt" in the reference frame is a
finite or integral transform, according to whether the system has a
finite or infinite number of elements. The types of coupling which yield
to the integral transform method include diffusive and elastic
interactions in "classical" systems as well as the more common
quantum-mechanical potentials. The purpose of this volume is to present
an orderly exposition of the theory and some of the applications of the
finite and integral transforms associated with the names of Fourier,
Bessel, Laplace, Hankel, Gauss, Bargmann, and several others in the same
vein. The volume is divided into four parts dealing, respectively, with
finite, series, integral, and canonical transforms. They are intended to
serve as independent units. The reader is assumed to have greater
mathematical sophistication in the later parts, though.