The authors initially planned to write an article describing the origins
and devel- opments of the theory of Fredholm operators and to present
their recollections of this topic. We started to read again classical
papers and we were sidetracked by the literature concerned with the
theory and applications of traces and determi- nants of infinite
matrices and integral operators. We were especially impressed by the
papers of Poincare, von Koch, Fredholm, Hilbert and Carleman, as well as
F. Riesz's book on infinite systems of linear equations. Consequently
our plans were changed and we decided to write a paper on the history of
determinants of infi- nite matrices and operators. During the
preparation of our paper we realized that many mathematical questions
had to be answered in order to gain a more com- plete understanding of
the subject. So, we changed our plans again and decided to present the
subject in a more advanced form which would satisfy our new require-
ments. This whole process took between four and five years of
challenging, but enjoyable work. This entailed the study of the
appropriate relatively recent results of Grothendieck, Ruston, Pietsch,
Hermann Konig and others. After the papers [GGK1] and [GGK2] were
published, we saw that the written material could serve as the basis of
a book.