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  1. Czesław Lejewski (2011). Logic and Non-Existence. Grazer Philosophische Studien 25:209-234.
    An attempt is made in the present essay to accommodate various senses of the notion of existence and ofthat of non-existence within the framework of logic. With this aim in view a system of Lesniewski's Ontology, referred to as System S, is outlined. Equipped with appropriate definitions and illustrated with a selection of theses it offers a logical theory of existence and non-existence. The usefulness of the theory is then tested by interpreting in its terms some of the principal notions (...)
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  2. Czesław Lejewski (1996). Patzig Günther. Die Aristotelische Syllogistik. Logisch-philologische Untersuchungen über das Buch A der “Ersten Analytiken.” Abhandlungen der Akademie der Wissenschaften in Göttingen, Philologisch-historische Klasse, ser. 3 no. 42. Vandenhoeck & Ruprecht, Göttingen 1959, 207 pp. [REVIEW] Journal of Symbolic Logic 31 (1):102-104.
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  3. Czesław Lejewski (1994). O dramatycznej fazie rozwojowej pansomatyzmu Kotarbińskiego. Filozofia Nauki 1.
    As the author sees it, Tadeusz Kotarbiński's reism is an ontology with semantical ramifications. Contrary to Kazimierz Ajdukiewicz's view the reist is not commited to any particular categorially determined language; he has to use, and is at liberty to do so, the language of whoever happens to be his opponent always provide that it is a categorially determined language. Contrary to Ajdukiewicz's opinion, the positive ontological thesis of resim (i.e. the thesis that for all a and b, if a is (...)
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  4. Czesław Lejewski (1993). Logika, ontologia, metafizyka. Filozofia Nauki 1.
    According to the author, no body of theories deserves to be called philosophy unless some of these theories and problems fall within the province of metphysics. No problems deserves the name of metaphysics unless some of them add up to constitute ontology. The author presents the reistic version of the science of being as the union of Protothetic, Ontology, Mereology and Chronology. The next possible step in the construction of the reistic ontology will be Stereology (a kind of reistic geometry).
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  5. Czesław Lejewski (1989). Formalization of Functionally Complete Propositional Calculus with the Functor of Implication as the Only Primitive Term. Studia Logica 48 (4):479 - 494.
    The most difficult problem that Leniewski came across in constructing his system of the foundations of mathematics was the problem of defining definitions, as he used to put it. He solved it to his satisfaction only when he had completed the formalization of his protothetic and ontology. By formalization of a deductive system one ought to understand in this context the statement, as precise and unambiguous as possible, of the conditions an expression has to satisfy if it is added to (...)
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  6. Czesław Lejewski (1988). Co filozofia zawdzięcza apostacie filozofii? Studia Filozoficzne 271 (6-7).
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  7. C. Lejewski (1985). A System of Logic for Bicategorial Ontology. An Overdue Postscript. Conceptus 19 (48):73-85.
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  8. Czesław Lejewski (1985). Accommodating the Informal Notion of Class Within the Framework of Lesniewski's Ontology. Dialectica 39 (3):217-241.
  9. Czesław Lejewski (1984). Consistency of Leśniewski's Mereology. In. In Jan T. J. Srzednicki, V. F. Rickey & J. Czelakowski (eds.), Leśniewski's Systems. Distributors for the United States and Canada, Kluwer Boston. 231--238.
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  10. Czesław Lejewski (1984). Logic and Existence. In. In Jan T. J. Srzednicki, V. F. Rickey & J. Czelakowski (eds.), Leśniewski's Systems. Distributors for the United States and Canada, Kluwer Boston. 45--58.
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  11. Czesław Lejewski (1984). On Leśniewski's Ontology. In. In Jan T. J. Srzednicki, V. F. Rickey & J. Czelakowski (eds.), Leśniewski's Systems. Distributors for the United States and Canada, Kluwer Boston. 123--148.
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  12. C. Lejewski (1983). Essay Review. History and Philosophy of Logic 4 (1-2):91-96.
    J. PELC (ed.) Semiotics in Poland 1894-1969. Translation from the Polish by 0. Wojtasiewicz. Dordrecht, Boston and London; D. Reidel Publishing Company; Warsaw: PWN?Polish Scientific Publishers; 1981. xxvi + 504 pp. Df. 105/ $49.50.
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  13. C. Lejewski (1983). A Note on Leśniewski's Axiom System for the Mereological Notion of Ingredient or Element. Topoi 2 (1):63-71.
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  14. C. Lejewski (1982). Review: Kazimierz Ajdukiewicz, Jerzy Giedymin, The Scientific World-Perspective and Other Essays, 1931-1963. [REVIEW] Journal of Symbolic Logic 47 (2):457-463.
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  15. Czeslaw Lejewski (1982). Ontology: What Next. In Werner Leinfellner (ed.), Language and Ontology. Hölder-Pichler-Tempsky / Reidel. 173--86.
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  16. Czesław Lejewski (1981). Propositional Attitudes and Extensionality. In Edgar Morscher, Otto Neumaier & Gerhard Zecha (eds.), Philosophie Als Wissenschaft. Comes Verlag. 211--228.
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  17. Czesław Lejewski (1980). Postscript: ``A Note Concerning the Notion of Mereological Class''. Notre Dame Journal of Formal Logic 21 (4):679-682.
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  18. C. Lejewski (1979). Foundations: Essays in Philosophy, Logic, Mathematics and Economics By F. P. Ramsey Edited by D. H. Mellor London and Henley: Routledge and Kegan Paul, 1978, Viii + 287 Pp., £9.50. [REVIEW] Philosophy 54 (208):259-.
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  19. Czesław Lejewski (1978). A Note Concerning the Notion of Mereological Class. Notre Dame Journal of Formal Logic 19 (2):251-263.
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  20. Czesław Lejewski (1977). Systems of Leśniewski's Ontology with the Functor of Weak Inclusion as the Only Primitive Term. Studia Logica 36 (4):323-349.
  21. Czeslaw Lejewski (1976). Reply to Comments. In J. P. Cleave & Stephan Körner (eds.), Philosophy of Logic: Papers and Discussions. University of California Press. 48.
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  22. Czesław Lejewski (1976). On Prosleptic Premisses. Notre Dame Journal of Formal Logic 17 (1):1-18.
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  23. C. Lejewski (1975). Review: A. N. Prior, J. N. Crossley, M. A. E. Dummett, Existence in Lesniewski and in Russell. [REVIEW] Journal of Symbolic Logic 40 (3):458-458.
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  24. Czesław Lejewski & William Haas (1975). Syntax and Semantics of Ordinary Language. Aristotelian Society Supplementary Volume 49:127 - 169.
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  25. Czesŀaw Lejewski (1974). A System of Logic for Bicategorial Ontology. Journal of Philosophical Logic 3 (3):265 - 283.
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  26. C. Lejewski (1973). Review: Andrzej Grzegorczyk, On Certain Formal Consequences of Reism. [REVIEW] Journal of Symbolic Logic 38 (3):536-536.
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  27. Czesław Lejewski (1973). A Contribution to the Study of Extended Mereologies. Notre Dame Journal of Formal Logic 14 (1):55-67.
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  28. Czesław Lejewski (1970). Quantification and Ontological Commitment. In. In Hermann Bondi, Wolfgang Yourgrau & Allen duPont Breck (eds.), Physics, Logic, and History. New York,Plenum Press. 173--190.
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  29. C. Lejewski & H. Skolimowski (1969). Polish Analytical Philosophy. A Survey and A Comparison with British Analytical Philosophy. Philosophical Quarterly 19 (77):363.
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  30. Czesław Lejewski (1969). Consistency of Leśniewski's Mereology. Journal of Symbolic Logic 34 (3):321-328.
  31. C. Lejewski (1968). Rachunek Zdań, W Którym Trzy Nawzajem Nie Dające Się Zdefiniować Funktory Występują Jako Terminy Pierwotne. Studia Logica 22 (1):47-48.
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  32. Czesław Lejewski (1968). A Propositional Calculus in Which Three Mutually Undefinable Functors Are Used as Primitive Terms. Studia Logica 22 (1):17 - 50.
  33. Czeslaw Lejewski & Zdzislaw Pawlak (1967). Automatic Theorem-Proving. Philosophical Quarterly 17 (69):369.
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  34. Czesław Lejewski (1967). A Single Axiom for the Mereological Notion of Proper Part. Notre Dame Journal of Formal Logic 8 (4):279-285.
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  35. Czesław Lejewski (1967). Ancient Logic. In Paul Edwards (ed.), The Encyclopedia of Philosophy. New York, Macmillan. 4--513.
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  36. Czeslaw Lejewski (1966). Review: Gunther Patzig, Die Aristotelische Syllogistik. Logisch-Philologische Untersuchungen uber das Buch A der "Ersten Analytiken.". [REVIEW] Journal of Symbolic Logic 31 (1):102-104.
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  37. Roland Hall & C. Lejewski (1965). Symposium: Parts of Speech. Aristotelian Society Supplementary Volume 39:173 - 204.
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  38. C. Lejewski (1964). Review: Janina Kotarbinska, The Concept of Sign. [REVIEW] Journal of Symbolic Logic 29 (2):88-89.
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  39. Czeslaw Lejewski (1964). Review: Stanislaw Kaminski, Hobbes' Theory of Definition. [REVIEW] Journal of Symbolic Logic 29 (1):49-49.
  40. Czeslaw Lejewski (1964). Review: Zbigniew Czerwinski, On the Concept of Cause and Mill's Methods. [REVIEW] Journal of Symbolic Logic 29 (1):49-50.
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  41. Czesław Lejewski, W. K. C. Guthrie, Peter Winch, Frederick C. Copleston & R. Harré (1964). New Books. [REVIEW] Mind 73 (291):446-461.
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  42. Czeslaw Lejewski (1963). Reviews. [REVIEW] British Journal for the Philosophy of Science 13 (52):249-251.
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  43. CzesŁaw Lejewski (1963). Aristotle's Syllogistic and its Extensions. Synthese 15 (1):125 - 154.
  44. Czeslaw Lejewski (1962). Review: Witold Michalowski, Zagadnienie Nazw Pustych W Sylogistyce Arystotelesa W Swietle "Ontologii" Lesniewskiego (Das Problem der Leeren Namen in der Syllogistik Im Lichte der "Ontologie" von Lesniewski). [REVIEW] Journal of Symbolic Logic 27 (1):117-117.
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  45. Czesław Lejewski (1962). A Note on a Problem Concerning the Axiomatic Foundations of Mereology. Notre Dame Journal of Formal Logic 4 (2):135-139.
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  46. Czesław Lejewski (1961). On Prosleptic Syllogisms. Notre Dame Journal of Formal Logic 2 (3):158-176.
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  47. Czesław Lejewski (1961). Studies in the Axiomatic Foundations of Boolean Algebra. III. Notre Dame Journal of Formal Logic 2 (2):79-93.
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  48. Czesław Lejewski (1960). Studies in the Axiomatic Foundations of Boolean Algebra. I. Notre Dame Journal of Formal Logic 1 (1-2):23-47.
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  49. Czesław Lejewski (1960). Studies in the Axiomatic Foundations of Boolean Algebra. II. Notre Dame Journal of Formal Logic 1 (3):91-106.
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  50. Czesław Lejewski (1960). A Re-Examination of the Russellian Theory of Descriptions. Philosophy 35 (132):14-29.
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