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In this essay I investigate the interplay between actual and potential properties of a thing within an Aristotelian conceptual framework. A minimal formal treatment of such interplay is proposed, outlining the actual or possible causal impact of these properties with respect to the changes of a thing in question. I also mention the historically interesting controversy between Aristotle and the Megarians concerning the relationship between power and act, as well as Hintikka’s application of the Principle of Plenitude. The essay ends (...) with certain suggestions for treating the problems of actual and potential properties by means of dispositions and contrary-to-fact conditionals. (shrink)

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There are two fundamental questions concerning the choice and presence of objects in various formal systems: Where do these objects come from? What do we know about them? To answer these questions I introduce the notion of a proto-ontology as the pre-theoretic realm of entities from which the basic objects – individuals – of the formal system S are postulated. The pragmatic aspects of such choices are investigated with regard to first-order logic, both pure and applied, set theory and mereology. (...) It is claimed that the postulated objects enter the formal system S with a package of properties and relationships, the recognition of which depends on the interpretation and application of the available predicates of S. If these properties and relationships are not made explicit, a possible clash may arise between them and the properties and relationships “assigned” to the individuals of S by the interpreted predicates of S. As regards the relationship between logic and metaphysics, I contend that logic can perhaps be viewed as the articulation of the fundamental features of proto-ontological objects without which no discourse or theory would be possible. In this sense logic could also be viewed as a theory and method of the construction of a well-articulated metaphysical theory. (shrink)

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When A. J. Ayer commented on Russell’s theory of acquaintance, he claimed that the person who is acquainted with an object knows that the object exists and also that the object in question has the properties which it appears to have. This essay employs Russell’s theory of knowledge by acquaintance from the period between 1910 and 1918 and critically analyzes both the existential and the descriptive statements as they are related to the object of acquaintance. In particular, Ayer’s views on (...) the relationship between appearance and reality are treated as unacceptable from any sound epistemological point of view. I believe that the logical analysis of these epistemological problems reveals intricate issues involved in such discussions, which transcend their limited historical context. (shrink)

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In this essay, I investigate the dynamic foundations of Hume’s philosophy which is so heavily dependent upon Newton’s physics. Hume’s ubiquitous phrase „force and vivacity” is symptomatic of his dynamic, rather than voluntaristic, position that dominates his interpretation of impressions, ideas, and causality in particular. After pointing out some inconsistencies of Hume’s Newtonism, I concentrate on Hume’s treatment of power. It is a well-known fact that Hume rejected natural powers, in fear of their occult character, but accepted human powers giving (...) them an actualist interpretation. I suggest that there is a dispositional treatment hidden in Hume’s statements which puts Hume in line with other philosophers of power. (shrink)

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Roku 1906 Łukasiewicz uverejnil podnetný návrh na logický výklad kauzálneho vzťahu pomocou pojmu nevyhnutnosti a jednoduchej závislosti. Uplatnil v ňom zákon transpozície, známy z výrokovej logiky, a modálne úvahy . Vo svojej historicky motivovanej analýze Łukasiewiczovho návrhu autor ukazuje, že Łukasiewiczovi sa nepodarilo oddeliť vzťah príčiny a účinku od vzťahu dôvodu a dôsledku, ani špecifikovať príslušné modality. Napriek tomu Łukasiewicz si zaslúži uznanie za pioniersky pokus traktovať tradičný filozofický problém kauzality netradičnými prostriedkami logiky relácií.

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This historically oriented article describes Whiteheadś life-long concern with logic. Although his creative phase in logic seemed to have ended with the publication of Principia Mathematica, he remained continuously interested in logic of relations and theory of events and even as a speculative metaphysician appreciated logic as - in his words - his "first love".

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Many philosophers have attempted to offer a logical theory of objects, employing different techniques. Thus R. Carnap tried to “reconstruct” logically the world by using the modern symbolic logic, while N. Goodman “constructed” the world with the help of the calculus of individuals or the logic of part-whole relations. W.V. Quine helped to steer the attention toward the question of ontological commitment and toward a theory of objects produced by a logical analysis of natural languages. Recently, there have been controversial (...) discussions concerning the metaphysical and logical aspects of objects in actual and possible worlds as well as new contributions to the theory of nonexistent objects, rekindling the old Russell-Meinong controversy. It seems that even the proposed theories of events, such as that of R. M. Martin, maintain the great significance of the notion of an object. Then there is a plethora of the so-called intensional objects, such as the alleged objects of propositional attitudes, the story of which is tied with the names of Frege, Russell, Carnap and many others. Is it possible to give an all-embracing theory of objects which would satisfy all the parties involved? Although such possibility may be very questionable, the instrumental role of logic for the development of the metaphysical theories of objects is indisputable. Two factors are, however, involved in the constitution of a logical theory of objects: the basis or the given data from which the theory starts; the logical apparatus employed, i.e., the logical axioms and rules of inference, just as the relevant semantical rules which are formulated in the metalanguage. While the logical apparatus is usually very clear, at least in the case of the formally well-construed theories, the given basis of a metaphysical theory T—as we may call it—might contain many tacit assumptions which would need a lot of clarification. It seems that philosophers fight more about the presuppositions and assertions of their systems than about the logic involved. I would like to discuss the interplay between the above two factors, starting with the realm of the given objects. As to the second factor—the logical apparatus involved—the contributions of first-order predicate logic and of the calculus of individuals will be considered. (shrink)

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A propositional interpretation of knowledge by acquaintance seems more promising than the nonpropositional one, endorsed by Russell. According to the propositional interpretation, to be acquainted with an object means to attend (pay attention) to individuating features of the object. For the actual, direct acquaintance with an object, a subject's perception of the object and his attending to the individuating features of it (just as the fact that these features do belonge to the object in question) are the essential factors. Proper (...) names of objects and subject's memory images referring to objects of acquaintance may be viewed as their special individuating features (in spite of being attached to these objects "externally"). For the dispositional (non-actual) notion of acquaintance, a relativization of time must be added, together with the subject's ability to attend to the individuating features of the object under proper conditions (when the object of previous acquaintance is presented or represented to the subject). Although the conditional formulas expressing these situations contribute to the explication of the concept of knowledge by acquaintance, their truth-status remains open and contingent upon the ways of solving the problem of individuation (identification). (shrink)

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A propositional interpretation of knowledge by acquaintance seems more promising than the nonpropositional one, endorsed by Russell. According to the propositional interpretation, to be acquainted with an object means to attend (pay attention) to individuating features of the object. For the actual, direct acquaintance with an object, a subject's perception of the object and his attending to the individuating features of it (just as the fact that these features do belonge to the object in question) are the essential factors. Proper (...) names of objects and subject's memory images referring to objects of acquaintance may be viewed as their special individuating features (in spite of being attached to these objects "externally"). For the dispositional (non-actual) notion of acquaintance, a relativization of time must be added, together with the subject's ability to attend to the individuating features of the object under proper conditions (when the object of previous acquaintance is presented or represented to the subject). Although the conditional formulas expressing these situations contribute to the explication of the concept of knowledge by acquaintance, their truth-status remains open and contingent upon the ways of solving the problem of individuation (identification). (shrink)

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In lieu of an abstract, here is a brief excerpt of the content:BOOK REVIEWS 349 Wittgenstein: From Mysticism to Ordinary Language: A Study of Viennese Positivism and the Thought of Ludwig Wittgenstein. By RUSSELL NIELI. SUNY Series in Philosophy. Albany; State University of New York Press, 1987. Pp. xvi + 261. $39.50 (cloth) ; $12.95 (paper). In his original and thought-provoking hook, Russell Nieli offers a well-documented interpretation of Wittgenstein's philosophical development from mysticism, which supposedly dominated the Tractatus Logico-Philosophicus (1921), (...) to ordinary language philosophy, as expressed, for instance, in the posthumously published Philosophical Investigations (1953). According to Nieli, Wittgenstein's rejection of traditional metaphysics and theology in the Tractatus was grossly misunderstood by the logical positivists of the Vienna Circle, who missed the main point, namely Wittgenstein's emphasis on the mystical ascent toward higher reality (God) which "lay outside and beyond the world" (p. xi). Metaphysics was rejected by Wittgenstein-Nieli claims-because it leads to " God-debasing profanation or impropriety " (p. 83); it attempts to say what cannot he said hut only shown. The logical system of the Tractatus is then " a precise delineation of the profane world which is left behind in the transcendental encounter with the Sacred" (p. 98). Allegedly, such mystical, ekstatic experience cannot he articulated by any however perfected linguistic medium, which hopelessly remains an " inner-worldly " phenomenon. Of course, this application of via negativa must have been totally alien to the Humean-empiricist philosophy of Wittgenstein's teacher, B. Russell, as well as to any positivistically oriented philosophers operating in the tradition of the Enlightenment. Nieli supports his claims and comparisons by very rich documentary material drawn from the history of mystical experiences and doctrines, just as from the recent philosophical and psychological sources: from St. Augustine, Pseudo-Dionysius, St. John of Cross, Kierkegaard, Schopenhauer, W. James, R. Carnap, Heidegger, Sartre, R. D. Laing, and many others. In addition, he follows closely Wittgenstein's personal and intellectual history, as it has been revealed by various relevant memoirs, notebooks, and recollections. As expected, Wittgenstein's alleged mystico-religious experiences are given prominent coverage. Wittgenstein's puzzling transition from the Tractarian logical atomism and picture theory of language to the ordinary language philosophy is treated by Nieli through the analogy of the prophet turning into a rabbi (this is already suggested by the title of his Preface). According to this characterization, the early Wittgenstein-the prophet- " has descended the mountain to join the priests and rabbis below, as 850 BOOK REVIEWS the immediate pastoral needs of society have come to overshadow the former concern with maintaining the truth and purity of mystic theophany " (p. 183). Nieli draws an interesting comparison between the development of Wittgenstein's later philosophy and the actions of the Jewish council of Jamnia in 90 A. D. which declared the end of the age of prophecy and canonized sacred writings of the past as models for the prescribed way of living. Regarded as an accumulation and expression of life-experiences and life-attitudes of common people, ordinary language acquired for Wittgenstein a new status as scripture. After the devastating experiences of the First World War Wittgenstein made remarkable steps in an attempt to help common people as a teacher in small Austrian villages. He gave away his fortune and even thought about joining a monastery. Nieli persuasively reports on Wittgenstein 's affinities to L. N. Tolstoy as well as on Wittgenstein's deeply troubled soul, for which hard physical work and communication with plain folks were cherished means for escaping the threat of mental insanity. The late Wittgenstein's concern with language-games, rule following, his quasi-behaviorism and emphatic rejection of the so-called private language-all of this is then explicable, Nieli believes, by Wittgenstein's search for and endorsement of the normal, sane, standard, commonsensical. Is it possible that Wittgenstein's struggle with the " dark side " of his tormented soul, reflecting almost a Manichean-Gnostic position, played such a decisive role in his production of a highly influential therapeutic linguistic philosophy? Nieli's affirmative answer seems plausible, yet it would need further elaboration, in particular with respect to Freud and depth-psychology. Nieli's sympathetic treatment of Wittgenstein's philosophy comes to a rather abrupt... (shrink)

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In lieu of an abstract, here is a brief excerpt of the content:356 BOOK REVIEWS The Logical Basis of Metaphysics. By MICHAEL DUMMETT; The William James Lectures, 1976. Cambridge, Mass.: Harvard University Press, 1991. Pp. xi + 355. $34.95 (cloth). Michael Dummett, who is Wykeham Professor of Logic at Oxford, represents an influential force in contemporary analytical philosophy. In the tradition of Gottlob Frege and Ludwig Wittgenstein, Dum· mett has contributed significant works in philosophy of language (theory of meaning) and (...) intuitionistic logic as well as in current metaphysics, liberated from the neopositivistic imprisonment. Dummett's newest book has a self-explanatory title and is based on the William James Lectures which he delivered at Harvard University in 1976. As he explains in his Preface (1989), the publication of these lectures, however delayed and edited, should show the importance of the theory of meaning " for its more glamorous relative, metaphysics." Dummett is known as the leading proponent of "anti-realism "-a position endorsed, for instance, by Hilary Putnam-and the book under review amply demonstrates his views on this current controversial issue. Various " anti-realists," Dummett contends, share their rejection of the prin· ciple of bivalence (according to which every proposition is determinately either true or false) and of the related law of the excluded middle. Such rejections require the acceptance of " stricter canons of valid deductive reasoning" (p. 11), which, in turn, demand tightened and clarified concepts of meaning and truth or, in Wittgenstein's phrase, "a clear view of the working of our language." (p. 13). What one needs, in short, is a good theory of meaning which will " determine the correct logic " of a language and also settle various metaphysical controversies with regard to the nature of physical reality, time, mind, mathematics, etc. Dummett understands such theory of meaning as the key part of the philosophy of thought that has been so much stimulated by Frege's theory of sense and reference. Dummett's methodology de· mands therefore the following order: a good theory of meaning leading to " correct " logic, which in turn helps to settle metaphysical controversies. He aspires to show " how the choice between different logics arises at the level of the theory of meaning" (p. 18) and makes no apologies for using in this process a highly technical conceptual apparatus of mathematical logic. By his own admission, Dummett does not want to raise classical metaphysical questions of God, free will, and immortality, but "others almost equally profound" yet requiring a "painfully slow pace of advance" (p. 19). In spite of such declarations Dummett touches upon the problem of BOOK REVIEWS 357 God's omniscience: if, determinately, one of two possibilities holds, then God must know which of the two possibilities it is. Yet this example is utilized by Dummett not because of its theological impact (which he seems to take for granted) hut for the service it can provide in clarifying the problem of hivalence. At the very end of the last chapter, entitled ".Realism and the Theory of Meaning," Dummett concludes that the premise which expresses God's omniscience does not entail that God knows whether any given proposition is true or false nor does such a premise entail that the proposition is either true or false. Allegedly, an additional premise is needed asserting the truth or the falsehood of the proposition in question (whichever the case) " in order to deduce from his omniscience that he knows, in the sense stated, whether it is true or false" (p. 351). This anti-realistic position is thus based on the rejection of classical, two-valued logic and on the endorsement of intuitionistic logic, developed by the Dutch mathematician Brouwer and his followers, including Dummett himself (see his Elements of Intuitwnism, published in 1977 by Oxford Clarendon Press). According to this logic, if a statement is true only if we are able to prove it (to provide or construct evidence for it, etc.), then " there is no ground to assume every statement to he either true or false" (p. 9). Dummett claims that intuitionistic logic is supported by a verificationist meaningtheory which gets a large share of his attention. In the verificationist theory of meaning, " the meaning of a statement is determined by what we acknowledge as grounds... (shrink)

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