资 源 简 介
The first edition of the book was one of the elements of my habilitation (a quali-
fication above a Ph.D., which is a necessary step for obtaining the title of a
professor in Poland and other European countries), and as a result it was subse-
quently very carefully reviewed by four reviewers. The habilitation was a success.
Using the insightful comments from my reviewers, I have improved the current
version and eliminated some typographic errors that were initially overlooked.
