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  1. Leon Gumański (2008). A New Proof of Decidability of First-Order Functional Calculus. Ruch Filozoficzny 3 (3).
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  2. Leon Gumański (2006). Istnienie I Logika: Studia Z Filozofii. Wydawn. Uniwersytetu Mikołaja Kopernika.
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  3. Leon Gumański (2004). Prawda po prostu. Ruch Filozoficzny 4 (4).
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  4. Leon Gumański (2004). Uwagi o związku przyczynowym. Recenzje i sprawozdania: Andrzej Kucner- Friedrich Nietzsche. Źródła i perspektywy antropologii (Dariusz Barbaszyński). Ruch Filozoficzny 1 (1).
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  5. Leon Gumański (2000). Ostatnie słowo skazańca. Przeglad Filozoficzny - Nowa Seria 33 (1):188-192.
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  6. Leon Gumanski (ed.) (1999). To Be or Not to Be? Is That the Question?: And Other Studies in Ontology, Epistemology and Logic. Rodopi.
    This volume may be of interest for all those who wish that philosophy had a scientific character. As an adherent of the Polish Lvov-Warsaw Philosophical School, the author of this collection of papers endeavours to clarify some basic notions of epistemology, ontology and psychology of cognitive acts, such as "judgment", "existence", "being" etc. In his investigations he refrains from unnecessary rejection of common-sense knowledge but at the same time searches for suitable patterns in contemporary sciences. Regarding formal logic as a (...)
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  7. Leon Gumanski (1989). A New Approach To Realistic Epistemology. Dialectica 43 (1‐2):193-210.
    SummaryMain theses and assumptions: I. The so called sense‐data do not exist; II. In sensory cognition we perceive immediately objects, their features and relations; III. Each simple cognitive situation comprises cognitive conditions. Accordingly, a full simple sentence ought to have the shape: p“under conditions C” where p has one of the forms ‐ ; IV The subject should be treated as an abstract entity, not be identified with the man; V. Existence is an empirical feature; VI. Reality is the totality (...)
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  8. Leon Gumański (1988). Logika deontyczna czy logika norm? Studia Filozoficzne 277 (12).
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  9. Leon Gumański (1984). Tadeusz Czeżowski: An Advocate of Scentific Philosophy. Dialectics and Humanism 11 (4):657-664.
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  10. Leon Gumański (1983). An Extension of the Deontic Calculus DSC. Studia Logica 42 (2-3):129 - 137.
    The chief aim of the paper is to extend the calculusDSC 1 (see [4]) in such a way as to satisfy all the requirements listed in [4] as well as a further stipulation — called the principle of uninvolvement — to the effect that neither deontic compatibility nor deontic incompatibility of codes (see [2]) should be presupposed in deontic logic.
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  11. Leon Gumański (1981). Tadeusz Czeżowski's Logical Writings. Studia Logica 40 (2):203 - 207.
  12. Leon Gumanski (1981). The Deontic Calculus Dsc3. Bulletin of the Section of Logic 10 (2):63-66.
    The aim of the paper is to extend the calculus DSC1 in such a way as to satisfy all the requirements listed in [2] as well as a further stipulation { called `the principle of unionvolvement' { to the eect that neither deontic compatibility nor deontic incompatibility of codes should be presupposed in deontic logic. The observation that sentences of the form PKuw are stronger than it was suggested in [1] has been the point of departure.
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  13. Leon Gumański (1980). On Deontic Logic. Studia Logica 39 (1):63 - 75.
    Some requirements concerning deontic logic are formulated and discussed. Stress is laid on the need to distinguish between theories and deductive systems. It is argued that deontic theories need not be closed under the rule of detachment. Two deontic calculi, called DSC1, DSC2, are presented and talked over.
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  14. Leon Gumański (1977). An Improvement of the Deontic Calculus DSC. Studia Logica 36 (3):177 - 180.
  15. Leon Gumański (1975). Deontic Logic Without Certain Paradoxes. Studia Logica 34 (4):343 - 365.
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  16. Leon Gumański (1975). In the Service of Philosophy. Dialectics and Humanism 2 (1):181-186.
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  17. Leon Gumański (1969). Uwagi O Dowodzie Sformalizowanym I Konsekwencji. Studia Logica 25 (1):151 - 158.
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  18. Leon Gumański (1960). Singular Propositions, and 'This' as a Quantifier. Mind 69 (276):534-543.
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