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  1.  76
    Czesław Lejewski (1954). Logic and Existence. British Journal for the Philosophy of Science 5 (18):104-119.
  2. Czesław Lejewski (1958). On Lesniewski's Ontology. Ratio 1 (2):150-176.
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  3.  11
    C. Lejewski (1973). Selected Works. [REVIEW] Journal of Philosophy 70 (3):81-85.
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  4.  6
    Czesław Lejewski (1984). On Leśniewski's Ontology. In Jan T. J. Srzednicki, V. F. Rickey & J. Czelakowski (eds.), Journal of Symbolic Logic. Distributors for the United States and Canada, Kluwer Boston 123--148.
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  5.  44
    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.
  6.  41
    Czesław Lejewski (1969). Consistency of Leśniewski's Mereology. Journal of Symbolic Logic 34 (3):321-328.
  7.  55
    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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  8.  2
    Czesław Lejewski (1970). Quantification and Ontological Commitment. In Hermann Bondi, Wolfgang Yourgrau & Allen duPont Breck (eds.), Physics, Logic, and History. New York,Plenum Press 173--190.
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  9.  36
    Czesław Lejewski (1958). On Implicational Definitions. Studia Logica 8 (1):189 - 211.
  10.  17
    Czesław Lejewski (1985). 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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  11.  22
    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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  12.  6
    Czesław Lejewski & William Haas (1975). Syntax and Semantics of Ordinary Language. Aristotelian Society Supplementary Volume 49 (1):127 - 169.
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  13.  5
    Czesław Lejewski (1985). Accommodating the Informal Notion of Class Within the Framework of Lesniewski's Ontology. Dialectica 39 (3):217-241.
    SummaryInterpreted distributively the sentence‘Indiana is a member of the class of American federal states’means the same as‘Indiana is an American federal state’. In accordance with the collective sense of class expressions the sentence can be understood as implying that Indiana is a part of the country whose capital city is Washington. Neither interpretation appears to accommodate all the intuitions connected with the informal notion of class. A closer accommodation can be achieved, it seems, if class expressions are interpreted as verb‐like (...)
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  14.  4
    Czesław Lejewski (1960). A Re-Examination of the Russellian Theory of Descriptions. Philosophy 35 (132):14-29.
    The theory of descriptions occupies a very prominent place in Russell's system of logic and indeed in his system of philosophy. Since the publication of the now classical paper “On Denoting” in Mind for 1905 the theory had been incorporated into Principia Mathematica , the first volume of which appeared in 1910. In 1918 Russell discussed descriptions in his lectures on the Philosophy of Logical Atomism, which subsequently were published in The Monist for 1919. A very lucid exposition of the (...)
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  15.  24
    Czeslaw Lejewski (1955). New Books. [REVIEW] Mind 64 (254):446-448.
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  16.  8
    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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  17.  1
    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.
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  18. 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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  19.  9
    Czeslaw Lejewski (1974). A System of Logic for Bicategorial Ontology. Journal of Philosophical Logic 3 (3):265 - 283.
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  20.  14
    Czeslaw Lejewski (1959). Time and Modality, By A. N. Prior, Clarendon Press: Oxford University Press, 1957. Pp. Viii + 148. [REVIEW] Philosophy 34 (128):56-.
  21.  20
    CzesŁaw Lejewski (1963). Aristotle's Syllogistic and its Extensions. Synthese 15 (1):125 - 154.
  22.  20
    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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  23. P. F. Strawson & C. Lejewski (1957). Proper Names. Aristotelian Society Supplementary Volume 31:191-256.
     
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  24. Czesław Lejewski (1954). A Contribution to Lesniewski's Mereology. Polish Society of Arts and Sciences Abroad 5:43-50.
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  25.  8
    Czesław Lejewski (1961). On Prosleptic Syllogisms. Notre Dame Journal of Formal Logic 2 (3):158-176.
  26.  10
    P. F. Strawson & C. Lejewski (1957). Symposium: Proper Names. Aristotelian Society Supplementary Volume 31 (1):191 - 256.
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  27.  16
    Czesław Lejewski (1968). A Propositional Calculus in Which Three Mutually Undefinable Functors Are Used as Primitive Terms. Studia Logica 22 (1):17 - 50.
  28.  1
    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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  29.  11
    C. Lejewski (1958). O Definicjach Implikacyjnych. Studia Logica 8 (1):206-208.
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  30.  2
    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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  31.  4
    Czeslaw Lejewski (1957). Review: Nicholas Rescher, Axioms for the Part Relation. [REVIEW] Journal of Symbolic Logic 22 (2):213-214.
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  32.  4
    Czesław Lejewski (1984). Logic and Existence. In Jan T. J. Srzednicki, V. F. Rickey & J. Czelakowski (eds.), British Journal for the Philosophy of Science. Distributors for the United States and Canada, Kluwer Boston 45--58.
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  33.  1
    Czeslaw Lejewski (1955). Viii.—New Books. Mind 64 (254):279-280.
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  34.  3
    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.  9
    Czesław Lejewski (1976). On Prosleptic Premisses. Notre Dame Journal of Formal Logic 17 (1):1-18.
  36.  9
    C. Lejewski (1968). Rachunek Zdań, W Którym Trzy Nawzajem Nie Dające Się Zdefiniować Funktory Występują Jako Terminy Pierwotne. Studia Logica 22 (1):47-48.
  37.  3
    Roland Hall & C. Lejewski (1965). Symposium: Parts of Speech. Aristotelian Society Supplementary Volume 39:173 - 204.
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  38. Czeslaw Lejewski (1976). Outline Of An Ontology. Bulletin of the John Rylands Library 59 (1):127-147.
     
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  39.  7
    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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  40. M. Dummett, C. Lejewski, W. V. Quine & F. Sommers (1974). Discussion. Journal of Symbolic Logic 39 (2):361-362.
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  41.  2
    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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  42.  7
    Czeslaw Lejewski (1959). Reviews. [REVIEW] British Journal for the Philosophy of Science 9 (36):270-271.
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  43. Czesław Lejewski (1967). Ancient Logic. In Paul Edwards (ed.), The Encyclopedia of Philosophy. New York, Macmillan 513-520.
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  44. Roland Hall & C. Lejewski (1965). Parts of Speech. Aristotelian Society Supplementary Volume 39 (1):173-204.
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  45.  1
    Czeslaw Lejewski & Zdzislaw Pawlak (1967). Automatic Theorem-Proving. Philosophical Quarterly 17 (69):369.
  46.  1
    Czesław Lejewski (1984). Consistency of Leśniewski's Mereology. In Jan T. J. Srzednicki, V. F. Rickey & J. Czelakowski (eds.), Journal of Symbolic Logic. Distributors for the United States and Canada, Kluwer Boston 231--238.
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  47.  1
    Czeslaw Lejewski (1954). Review: Benson Mates, Stoic Logic. [REVIEW] Journal of Symbolic Logic 19 (1):71-72.
  48. Czeslaw Lejewski (1964). Review: Stanislaw Kaminski, Hobbes' Theory of Definition. [REVIEW] Journal of Symbolic Logic 29 (1):49-49.
     
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  49.  6
    Czeslaw Lejewski (1957). Reviews. [REVIEW] British Journal for the Philosophy of Science 8 (30):249-251.
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  50.  2
    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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