The concept of rough sets was introduced by Zdzisław Pawlak (1926--2006), and is a generalization of the standard notions of set theory, in that respect being similar to fuzzy set theory. It is apparently a quite active field, though not mainstream, with many researchers (primarily academics) from several countries working in it. This book is a commemoration volume in honor of Pawlak.

It consists of 21 contributed papers, and a 90-plus-page monograph, “Lattice Theory for Rough Sets.” Copyediting is minimal, a fact especially noticeable in papers with authors for whom English is a second language.

The papers range from explorations in the region of mathematical logic and formal methods (for example, “Propositional Logics from Rough Set Theory,” “A Four-Valued Logic for Rough Set-Like Approximate Reasoning”), to theoretical developments motivated by application domains (for example, “A Wistech Paradigm for Intelligent Systems,” “Discovering Association Rules in Incomplete Transactional Databases”), to reminiscences (“The Impact of Rough Set Research in China: In Commemoration of Professor Zdzisław Pawlak,” “A Personal View on AI, Rough Set Theory and Professor Pawlak”).

The technical material is expectedly dense, and would primarily be of interest to researchers and graduate students who are, or would like to be, in the area of rough sets.