The Lvov-Warsaw School was active in all spheres of philosophy. Its
members worked in the border area between philosophy and disci- plines
such as psychology, linguistics, and literary theory. But its most
important achievements were without doubt in logic and philosophical
analysis based on logic. The present book is concerned with fields to
which the Lvov-Warsaw School made its most important and famous
contributions. Data on the School as a whole are included only in the
first and last part of the book. This work is based on my monograph
(1985), which appeared in Polish. But it is not merely a translation,
because some fragments of the Polish version have been omitted (e. g.,
the chapter on ethics), and some have been revised. Many persons helped
me in my work on the book in Polish as well as on the present edition. I
must first mention the late Izydora D mbska, to whom this book is
dedicated. On various detailed issues I have availed myself of advice
and information given to me by Stefan Amsterdamski, Zdzislaw Augustynek,
Kazimierz Czarnota, Henryk Hii, Boleslaw Iwanus, Jacek Jadacki, Jacek
KabziIiski, Stanislaw Kiczuk, Tomasz Komendzinski, Janina Kotarbinska,
Czeslaw Lejewski, Jerzy Perzanowski, Marian Przet cki, the late Jerzy
Slupecki, Klemens Szaniawski, Stefan Zamecki, Zbigniew Zwinogrodzki i
Jan Zygmunt. I am indebted to Jaakko Hintikka for suggesting that my
book be trans- lated into English and published by Reidel. Olgierd
Wojtasiewicz helped me to prepare the English text.
