In this paper we introduce a new technique of proving undecidability results. This technique is based on the notion of a Thue tree. We also give examples of applications of this method to term rewriting, Horn implication problem and database dependencies.

Leszek Kołakowski explores 23 questions asked by great philosophers, introducing us to the great ideas and philosophers of Western thought.

Niniejsza wypowiedź jest próbą ukazania wyższości intelektualnej jednostki wybitnej nad jednostkami przeciętnymi. Transgresja jest tutaj formą przejścia, przemiany artysty, negującego zastany porządek świata, pragnącego podłożyć podwaliny pod nową rzeczywistość widzianą oczami szalonego geniusza - Friedricha Nietzschego, do którego często się odwołuję. Jego pojęcie \"Nadczłowieka\" jest tożsame z pojęciem genialnego twórcy, jednostki wybitnej, niezrozumiałej przez pospólstwo, która swoimi horyzontami twórczymi wybiega daleko poza własną epokę\".

"[An] important essay by a philosopher who more convincingly than any other I can think of demonstrates the continuing significance of his vocation in the life of our culture."--Karsten Harries, The New York Times Book Review With The Presence of Myth , Kolakowski demonstrates that no matter how hard man strives for purely rational thought, there has always been-and always will be-a reservoir of mythical images that lend "being" and "consciousness" a specifically human meaning. "Kolakowski undertakes a philosophy of culture (...) which extends to all realms of human intercourse--intellectual, artistic, scientific, and emotional. . . . [His] book has real significance for today, and may well become a classic in the philosophy of culture."-- Anglican Theological Review. (shrink)

Artykuł jest dygresyjnym przeglądem kilku internetowych witryn muzeów, wybranych i uporządkowanych tematycznie według klucza naukowych zainteresowań autora, zwłaszcza w kontekście sposobu udostępniania online zgromadzonych zbiorów. Instytucje muzealne proponują rozmaite metody i zakresy prezentacji: od najprostszego zamieszczenia fotografii kilkudziesięciu najbardziej spektakularnych zabytków (tzw. _highlights of the collection_) po profesjonalne bazy danych obejmujące całość zasobów wraz z obiektami magazynowymi, wspomagane zaawansowanymi narzędziami przeszukiwania i w pełni naukową deskrypcją. Bez wątpienia w obliczu tego faktu poszczególne muzea różnie definiują profil adresatów swoich kolekcji prezentowanych (...) online. (shrink)

Wychodząc od metaforycznego (figuralnego) ujęcia problemu zła, w oparciu o wybrane przemyślenia Leszka Kołakowskiego, rozważania składające się na artykuł zmierzają do namysłu nad „złem w polityce” w sensie niedomagań i nadużyć wolności: pokus władzy autokratycznej i totalitarnej. Dotyczą antropologicznego i politycznego przekraczania granic wolności kosztem (aż do zniesienia) wolności innych. Evil Politics or Trouble with the Devil. Reflections on the Political Demonology of Leszek Kołakowski Proceeding from a metaphorical (figurative) account of the problem of evil, and based on (...) class='Hi'>Leszek Kołakowski’s selected thoughts, this paper’s considerations aim to deliberate on “evil in politics” in the spirit of the shortcomings and excesses of freedom: namely, the lure of autocratic and totalitarian power. At issue is how the bounds of freedom are anthropologically and politically transgressed at the expense (to the point of abolishing) the freedom of others. (shrink)

The article deals with the philosophy of Nikolai Berdjaev (1874–1948), which he formulated between The Philosophy of Inequality (written in 1918, but published in 1923) and The New Middle - Ages (1924). Berdjaev’s philosophy is analyzed in the context of the Russian Revolution of 1917 and its aftermath. The other point of reference is the crisis of culture and civilisation, which affected the West in the inter-war period. Berdjaev’s position has been interpreted in view of the archetypal myth of the (...) struggle of the two principles, the principle of order (cosmos) and the forces of destruction (chaos). This myth is tied to the millenialist world view. Berdjaev took an anti-utopian stance. He juxtaposed the utopian-revolutionary principle with the hierarchical-creative one. From this position he criticized among others democracy, liberalism and socialism. In the midst of the crisis of the 1920s he remarked the possibility of spiritual rejuvenation putting forward the concept of the New Middle-Ages. One can say that at that time Berdjaev’s philosophy evolved within the conservative-creative framework, from the utopia of conservatism to the utopia of ‘free creativity’. (shrink)

The article deals with the philosophy of Nikolai Berdjaev, which he formulated between The Philosophy of Inequality and The New Middle-Ages. Berdjaev’s philosophy is analyzed in the context of the Russian Revolution of 1917 and its aftermath. The other point of reference is the crisis of culture and civilisation, which affected the West in the inter-war period. Berdjaev’s position has been interpreted in view of the archetypal myth of the struggle of the two principles, the principle of order and the (...) forces of destruction. This myth is tied to the millenialist world view. Berdjaev took an anti-utopian stance. He juxtaposed the utopian-revolutionary principle with the hierarchical-creative one. From this position he criticized among others democracy, liberalism and socialism. In the midst of the crisis of the 1920s he remarked the possibility of spiritual rejuvenation putting forward the concept of the New Middle-Ages. One can say that at that time Berdjaev’s philosophy evolved within the conservative-creative framework, from the utopia of conservatism to the utopia of ‘free creativity’. (shrink)

Podjęta w artykule problematyka dotyczy słynnej figury Wielkiego Inkwizytora, z którą spotykamy się w filozoficznych rozważaniach Józefa Tischnera; oczywiście, figury wprost zaczerpniętej z kart powieści Fiodora Dostojewskiego. Nie są to zresztą jedyne nawiązania myśli Tischnera do „imaginarium filozoficznego” twórcy Braci Karamazow. Warto zatem przyjrzeć się bliżej temu, co kryje się w „cieniu”, jaki roztacza wokół siebie Wielki Inkwizytor. Rozważania, nolens volens, muszą zatem dotyczyć „darów” Wielkiego Inkwizytora: pozornego dobra i pozornej wolności. Innymi słowy: zapytamy o postać Wielkiego Inkwizytora jako – (...) niepokojącą, wciąż groźną – „centralną postać nowożytnej filozofii władzy”. I Dostojewski, i Tischner przywołują bowiem pytania, które nie dają się prostym sposobem odsunąć i gestem tym niejako unieważnić, nadal stawiają nas przed niebezpieczeństwem „iluzji” politycznej, w której stawką pozostają najwyższe wartości. (shrink)

This book was written with the purpose of revealing the duty of each individual to search for truth and the meaning of existence. Thinking requires determination and endurance. It is not easy. Above all, passion for truth is necessary for every honest seeker.

This book explores the nature of modern culture as a culture of anxiety, analyzing the modes in which such anxiety presents itself. Drawing on sociological and philosophical concepts of modernity, the author builds on the work of Marx, Nietzsche and Freud to offer an understanding of modern anxiety culture as the reverse side of risk culture, which stabilizes itself by concealing or making familiar the social phenomena of risk society. Through explorations of memory, politics, art, clairvoyance, notions of national community (...) and identity, this volume sheds light on the fissures in our culture where anxiety appears, thus revealing its underlying volatility. A study of the ruptures in our modern culture, Anxiety and Lucidity will appeal to scholars of sociology, social theory, anthropology and philosophy with interests in late modern culture. (shrink)

Leszek Kolakowski discusses, in a highly original way, the arguments for and against the existence of God as they have been conducted through the ages. He examines the critiques of religious belief, from the Epicureans through Nietzsche to contemporary anthropological inquiry, the assumptions that underlie them, and the counter-arguments of such apologists as Descartes, Leibniz, and Pascal. His exploration of the philosophy of religion covers the historical discussions of the nature and existence of evil, the importance of the concepts (...) of failure and eternity to the religious impulse, the relationship between skepticism and mysticism, and the place of reason, understanding, and in models of religious thought. He examines why people, throughout known history, have cherished the idea of eternity and existence after death, and why this hope has been dependent on the worship of an eternal reality. He confronts the problems of meaning in religious language. (shrink)

Poland, after social-politic-economic transformation in 1989, became a capitalistic, free-market country. In this conditions human being can be perceived as an object, not a subject of economic life. Therefore the import ant issue is to take up problems associated with human subjectivity. And human subjectivity is expressed in his personal dignity.

My Ph.D. dissertation written under the supervision of Prof. Tomasz Placek at the Institute of Philosophy of the Jagiellonian University in Kraków. In one of its most basic and informal shapes, the principle of the common cause states that any surprising correlation between two factors which are believed not to directly influence one another is due to their common cause. Here we will be concerned with a version od this idea which possesses a purely probabilistic formulation. It was introduced, in (...) the form of a general principle, by Hans Reichenbach in his posthumously published book "The Direction of Time". The central notion of the principle in Reichenbach's formulation, and of the current essay, is that of screening off: two correlated events are screened off by a third event if conditioning on the third event makes them probabilistically independent. Reichenbach's principle marks also the beginning of a new field of philosophy: namely, that of ``probabilistic causality''. For the most part, the current essay can be seen as an effort at checking how far one can go with the purely statistical notions revolving around Reichenbach's idea of common cause. In short, the answer is ``surprisingly far''; in some classes of probability spaces all correlations between ``interesting'' events possess explanations of such sort. However, this fact lends itself to opposing interpretations; more on that in the conclusion. Chapters 6 and 7 contain mathematical results concerning these issues. The screening-off condition requires an equality of a probabilistic nature to hold; chapter 8 is a short discussion of slightly weakened versions of the condition, which hold if the sides of the above mentioned equality differ to a small degree. In chapter 2, after some mathematical preliminaries, we study the various formulations of the principle which might be said to stem from the original idea of Reichenbach. We also examine a few of the most salient counterarguments, which undermine at least some of the formulations. Chapter 3 is of a formal nature, dealing with various probabilistic notions which can be thought of as generalizations of Reichenbach's concept of common cause. The next chapter concerns the relationship between the idea of common causal explanation and the Bell inequalities. In chapter 5 we briefly present the form of Reichenbach's principle which can be found in the field of representing causal structures by means of directed acyclic graphs. (shrink)

We introduce the notion of a Minkowskian Branching Structure ("MBS" for short). Then we prove some results concerning the phenomenon of funny business in its finitary and infinitary variants.