24 found
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Jan Zygmunt [23]Jana Zygmunt [1]
  1.  34
    Adolf Lindenbaum: Notes on His Life, with Bibliography and Selected References.Jan Zygmunt & Robert Purdy - 2014 - Logica Universalis 8 (3-4):285-320.
    Notes on the life of Adolf Lindenbaum, a complete bibliography of his published works, and selected references to his unpublished results.
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  2.  43
    A Note on Direct Products and Ultraproducts of Logical Matrices.Jan Zygmunt - 1974 - Studia Logica 33 (4):349 - 357.
    In this contribution we shall characterize matrix consequence operation determined by a direct product and an ultraproduct of a family of logical matrices. As an application we shall describe finite consequence operations with the help of ultrapowers.
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  3.  28
    On the Degree of Complexity of Sentential Logics. A Couple of Examples.Jacek Hawranek & Jan Zygmunt - 1981 - Studia Logica 40 (2):141 - 153.
    The first part of the paper is a reminder of fundamental results connected with the adequacy problem for sentential logics with respect to matrix semantics. One of the main notions associated with the problem, namely that of the degree of complexity of a sentential logic, is elucidated by a couple of examples in the second part of the paper. E.g., it is shown that the minimal logic of Johansson and some of its extensions have degree of complexity 2. This is (...)
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  4.  24
    Mojżesz Presburger: Life and Work.Jan Zygmunt - 1991 - History and Philosophy of Logic 12 (2):211-223.
    The life and work of Moj?esz Presburger (1904?1943?) are summarised in this article. Although his production in logic was small, it had considerable impact, both his own researches and his editions of lecture notes of Adjukiewicz and ?ukasiewicz. In addition, the surviving records of his student time at Warsaw University provide information on a little-studied topic.
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  5.  32
    Jerzy Słupecki (1904–1987): Life and Work.Jan Woleński & Jan Zygmunt - 1989 - Studia Logica 48 (4):401 - 411.
  6.  35
    A Theorem of the Degree of Complexity of Some Sentential Logics.Jacek Hawranek & Jan Zygmunt - 1980 - Bulletin of the Section of Logic 9 (2):67-69.
    x1. This paper is a contribution to matrix semantics for sentential logics as presented in Los and Suszko [1] and Wojcicki [3], [4]. A generalization of Lindenbaum completeness lemma says that for each sentential logic there is a class K of matrices of the form such that the class is adequate for the logic, i.e., C = CnK.
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  7. Direct Product of Consequence Operations.Jan Zygmunt - 1972 - Bulletin of the Section of Logic 1 (4):61-64.
     
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  8.  27
    Some Elementary Properties of Conditionally Distributive Lattices.Jacek Hawranek & Jan Zygmunt - 1983 - Bulletin of the Section of Logic 12 (3):117-120.
    The notion of a conditionally distributive lattice was introduced by B. Wolniewicz while formally investigating the ontology of situations . In several of this lectures he has appealed for a study of that class of lattices. The present abstract is a response to that request.
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  9.  16
    Notes on Decidability and Finite Approximability of Sentential Logics.Jana Zygmunt - 1981 - Bulletin of the Section of Logic 10 (1):38-40.
    This is an abstract of the paper accepted for publication in \Acta Uni- versitatis Wratislaviensis", series \Prace Filozoczne { Logika". The paper was presented at the 25th Conference for the History of Logic, Krakow, October 5-7, 1979.
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  10.  27
    Another Proof of Wojtylak's Theorem.Jacek Hawranek & Jan Zygmunt - 1981 - Bulletin of the Section of Logic 10 (2):80-81.
    The aim of this note is to give an example of application of model theory to the theory of logical matrices. . More precisely, we show that Wojtylak's representation theorem is an immediate consequence of a result due to Mal'cev . Throughout the present note we assume that matrices, and classes of matrices under consideration are of the same xed similarity type. Suppose that K is an arbitrary class of matrices, and M is a matrix . We say that M1 (...)
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  11.  26
    On the Degree of Complexity of Sentential Logics.II. An Example of the Logic with Semi-Negation.Jacek Hawranek & Jan Zygmunt - 1984 - Studia Logica 43 (4):405 - 413.
    In this paper being a sequel to our [1] the logic with semi-negation is chosen as an example to elucidate some basic notions of the semantics for sentential calculi. E.g., there are shown some links between the Post number and the degree of complexity of a sentential logic, and it is proved that the degree of complexity of the sentential logic with semi-negation is 20. This is the first known example of a logic with such a degree of complexity. The (...)
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  12.  30
    Comments on a Question of Wolniewicz.Jacek Hawranek & Jan Zygmunt - 1990 - Bulletin of the Section of Logic 19 (4):128-132.
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  13.  27
    Revies.Jan Zygmunt - 1976 - Studia Logica 35 (3):323-326.
  14.  33
    The Logical Investigations of Jan Kalicki.Jan Zygmunt - 1981 - History and Philosophy of Logic 2 (1-2):41-53.
    This paper describes the work of the Polish logician Jan Kalicki (1922?1953). After a biographical introduction, his work on logical matrices and equational logic is appraised. A bibliography of his papers and reviews is also included.
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  15.  19
    Preface.Ilkka Niiniluoto & Jan Zygmunt - 1983 - Studia Logica 42 (2-3):117-118.
  16.  15
    Notes on the Semantics for the Logic with Semi-Negation.Jacek Hawranek & Jan Zygmunt - 1983 - Bulletin of the Section of Logic 12 (4):152-155.
    . In our paper, presented here in abstract form, we consider the sentential logic with semi-negation. It should be stressed, however, that our main interest is not that logic itself but rather more general matters concerning the theory of matrix semantics for sentential logics. The logic with semi-negation provides a relevant example for elucidating such basic notions of matrix semantics as degree of complexity, degree of uniformity, and self-referentiality. Thus our paper being a contribution to the theory of matrix semantics (...)
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  17.  27
    Books Received. [REVIEW]Jan Zygmunt, Ewa Orłowska, Zbigniew Badura, Ewa Żarnecka-Biały & Jan Woleńskl - 1983 - Studia Logica 42 (1):105-111.
  18.  22
    Books Received. [REVIEW]Wiesław Dziobiak, Andrzej Wroński, Wojciech Suchoń, Jan Zygmunt & Ryszard Wójcicki - 1981 - Studia Logica 40 (4):415-421.
  19.  17
    Roman Suszko (1919–1979): A Bibliography of the Published Work with an Outline of His Logical Investigations.Jan Zygmunt & Mieczysław Omyła - 1984 - Studia Logica 43 (4):421 - 441.
  20.  15
    A Bibliography of the Published Work of Jerzy Słupecki.Jan Zygmunt - 1989 - Studia Logica 48 (4):413 - 421.
  21.  11
    Roman Suszko (1919-1979): A Bibliography of the Published Work with an Outline of His Logical Investigations.Mieczysjław Omyła & Jan Zygmunt - 1984 - Studia Logica 43 (4):421 - 441.
  22.  12
    Reviews. [REVIEW]Grzegorz Malinowski, Jan Zygmunt, W. Berkson & George Berger - 1978 - Erkenntnis 12 (3):369-402.
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  23. Entailment Relations and Matrices I.Jan Zygmunt - 1979 - Bulletin of the Section of Logic 8 (2):112-115.
    In this paper we extend some techniques from the theory of conse- quences operations and logical matrices into the wider area of entailment relations.
     
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  24. Kurt Godel's Doctoral Dissertation.Jan Zygmunt - 1973 - In Stanisław J. Surma (ed.), Studies in the History of Mathematical Logic. Wrocław, Zakład Narodowy Im. Ossolinskich. pp. 153.
     
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