The subject of this book is the higher transcendental function known as
the confluent hypergeometric function. In the last two decades this
function has taken on an ever increasing significance because of its use
in the application of mathematics to physical and technical problems.
There is no doubt that this trend will continue until the general theory
of confluent hypergeometric functions becomes familiar to the majority
of physicists in much the same way as the cylinder functions, which were
previously less well known, are now used in many engineering and
physical problems. This book is intended to further this development.
The important practical significance of the functions which are treated
hardly demands an involved discussion since they include, as special
cases, a number of simpler special functions which have long been the
everyday tool of the physicist. It is sufficient to mention that these
include, among others, the logarithmic integral, the integral sine and
cosine, the error integral, the Fresnel integral, the cylinder functions
and the cylinder function in parabolic cylindrical coordinates. For
anyone who puts forth the effort to study the confluent hypergeometric
function in more detail there is the inestimable advantage of being able
to understand the properties of other functions derivable from it. This
gen- eral point of view is particularly useful in connection with series
ex- pansions valid for values of the argument near zero or infinity and
in connection with the various integral representations.