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Profile: Cezary Cieslinski (University of Warsaw)
  1.  54
    Gödelizing the Yablo Sequence.Cezary Cieśliński & Rafal Urbaniak - 2013 - Journal of Philosophical Logic 42 (5):679-695.
    We investigate what happens when ‘truth’ is replaced with ‘provability’ in Yablo’s paradox. By diagonalization, appropriate sequences of sentences can be constructed. Such sequences contain no sentence decided by the background consistent and sufficiently strong arithmetical theory. If the provability predicate satisfies the derivability conditions, each such sentence is provably equivalent to the consistency statement and to the Gödel sentence. Thus each two such sentences are provably equivalent to each other. The same holds for the arithmetization of the existential Yablo (...)
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  2.  59
    Truth, Conservativeness, and Provability.Cezary Cieśliński - 2010 - Mind 119 (474):409-422.
    Conservativeness has been proposed as an important requirement for deflationary truth theories. This in turn gave rise to the so-called ‘conservativeness argument’ against deflationism: a theory of truth which is conservative over its base theory S cannot be adequate, because it cannot prove that all theorems of S are true. In this paper we show that the problems confronting the deflationist are in fact more basic: even the observation that logic is true is beyond his reach. This seems to conflict (...)
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  3.  74
    Typed and Untyped Disquotational Truth.Cezary Cieśliński - 2015 - In Kentaro Fujimoto, José Martínez Fernández, Henri Galinon & Theodora Achourioti (eds.), Unifying the Philosophy of Truth. Springer Verlag.
    We present an overview of typed and untyped disquotational truth theories with the emphasis on their (non)conservativity over the base theory of syntax. Two types of conservativity are discussed: syntactic and semantic. We observe in particular that TB—one of the most basic disquotational theories—is not semantically conservative over its base; we show also that an untyped disquotational theory PTB is a syntactically conservative extension of Peano Arithmetic.
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  4.  97
    The Innocence of Truth.Cezary Cieśliński - 2015 - Dialectica 69 (1):61-85.
    One of the popular explications of the deflationary tenet of ‘thinness’ of truth is the conservativeness demand: the declaration that a deflationary truth theory should be conservative over its base. This paper contains a critical discussion and assessment of this demand. We ask and answer the question of whether conservativity forms a part of deflationary doctrines.
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  5.  63
    Deflationary Truth and Pathologies.Cezary Cieśliński - 2010 - Journal of Philosophical Logic 39 (3):325-337.
    By a classical result of Kotlarski, Krajewski and Lachlan, pathological satisfaction classes can be constructed for countable, recursively saturated models of Peano arithmetic. In this paper we consider the question of whether the pathology can be eliminated; we ask in effect what generalities involving the notion of truth can be obtained in a deflationary truth theory (a theory of truth which is conservative over its base). It is shown that the answer depends on the notion of pathology we adopt. It (...)
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  6. Yablo Sequences in Truth Theories.Cezary Cieśliński - 2013 - In K. Lodaya (ed.), Logic and Its Applications, Lecture Notes in Computer Science LNCS 7750. Springer. pp. 127--138.
    We investigate the properties of Yablo sentences and for- mulas in theories of truth. Questions concerning provability of Yablo sentences in various truth systems, their provable equivalence, and their equivalence to the statements of their own untruth are discussed and answered.
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  7.  17
    Minimalism and the Generalisation Problem: On Horwich’s Second Solution.Cezary Cieśliński - forthcoming - Synthese:1-25.
    Disquotational theories of truth are often criticised for being too weak to prove interesting generalisations about truth. In this paper we will propose a certain formal theory to serve as a framework for a solution of the generalisation problem. In contrast with Horwich’s original proposal, our framework will eschew psychological notions altogether, replacing them with the epistemic notion of believability. The aim will be to explain why someone who accepts a given disquotational truth theory Th, should also accept various generalisations (...)
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  8.  26
    T-Equivalences for Positive Sentences.Cezary Cieśliński - 2011 - Review of Symbolic Logic 4 (2):319-325.
    Answering a question formulated by Halbach (2009), I show that a disquotational truth theory, which takes as axioms all positive substitutions of the sentential T-schema, together with all instances of induction in the language with the truth predicate, is conservative over its syntactical base.
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  9.  9
    Heterologicality and Incompleteness.Cezary Cieslinski - 2002 - Mathematical Logic Quarterly 48 (1):105-110.
    We present a semantic proof of Gödel's second incompleteness theorem, employing Grelling's antinomy of heterological expressions. For a theory T containing ZF, we define the sentence HETT which says intuitively that the predicate “heterological” is itself heterological. We show that this sentence doesn't follow from T and is equivalent to the consistency of T. Finally we show how to construct a similar incompleteness proof for Peano Arithmetic.
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  10.  55
    Deflationism, Conservativeness and Maximality.Cezary Cieśliński - 2007 - Journal of Philosophical Logic 36 (6):695 - 705.
    We discuss two desirable properties of deflationary truth theories: conservativeness and maximality. Joining them together, we obtain a notion of a maximal conservative truth theory - a theory which is conservative over its base, but can't be enlarged any further without losing its conservative character. There are indeed such theories; we show however that none of them is axiomatizable, and moreover, that there will be in fact continuum many theories of this sort. It turns out in effect that the deflationist (...)
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  11.  34
    How Tarski Defined the Undefinable.Cezary Cieśliński - 2015 - European Review 23 (01):139 - 149.
    This paper describes Tarski’s project of rehabilitating the notion of truth, previously considered dubious by many philosophers. The project was realized by providing a formal truth definition, which does not employ any problematic concept.
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  12.  32
    Dyskwotacyjna koncepcja prawdy i problem generalizacji.Cezary Cieśliński - 2008 - Filozofia Nauki 3.
    The paper contains a discussion of a basic difficulty encountered by adherents of the disquotational conception of truth. The problem is that the disquotational theory seems to weak to prove many important truth-theoretical generalizations, like e.g. "All substitutions of the law of excluded middle are true". Various ways of saving the disquotationalist from this objection are analyzed and deemed unsatisfactory.
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  13.  12
    Willard Van Orman Quine o prawdzie i analityczności.Cezary Cieśliński - 2010 - Przegląd Filozoficzny 68 (4):233-247.
  14.  21
    Löb's Theorem in a Set Theoretical Setting.Cezary Cieśliński - 2003 - Studia Logica 75 (3):319 - 326.
    We present a semantic proof of Löb's theorem for theories T containing ZF. Without using the diagonalization lemma, we construct a sentence AUT T, which says intuitively that the predicate autological with respect to T (i.e. applying to itself in every model of T) is itself autological with respect to T. In effect, the sentence AUT T states I follow semantically from T. Then we show that this sentence indeed follows from T and therefore is true.
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  15. Arytmetyka i intensjonalność.Cezary Cieśliński - 2001 - Filozofia Nauki 4.
    The paper consists of two pats. The first part contains a critical review of "Gödel theorems, possible worlds and intensionality" by W. Krysztofiak. Krysztofiak argues that Gödel's incompleteness theorem and, in particular, the technique of aritmetization of syntax, gives rise to intensionality and intentionality in arithmetic. The author tries to show that these claims are mistaken and based on a simple misunderstanding of the incompleteness theorem and its proof. In the second part the author explains the traditional use (in the (...)
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  16. Deflationism, Conservativeness and Maximality.Cezary Cieśliński - 2007 - Journal of Philosophical Logic 36 (1):695--705.
    We discuss two desirable properties of deflationary truth theories: conservativeness and maximality. Joining them together, we obtain a notion of a maximal conservative truth theory – a theory which is conservative over its base, but can’t be enlarged any further without losing its conservative character. There are indeed such theories; we show however that none of them is axiomatizable, and moreover, that there will be in fact continuum many theories of this sort. It turns out in effect that the deflationist (...)
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  17. Deflacyjna koncepcja prawdy. Wybrane zagadnienia logiczne.Cezary Cieśliński - 2009 - Wydawnictwo Naukowe Semper.
  18. Dlaczego prawda jest (nie)definiowalna.Cezary Cieśliński - 2005 - Filozofia Nauki 1.
    The aim of this paper is to consider the question about the reasons of the indefinability of truth. We note at the start that a formula with one free variable can function as a truth predicate for a given set of sentences in two different (although related) senses: relative to a model and relative to a theory. By methods due to Alfred Tarski it can be shown that some sets of sentences are too large to admit a truth predicate (in (...)
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  19. Quine o Prawdzie I Analityczności.Cezary Cieśliński - 2008 - Przeglad Filozoficzny - Nowa Seria 68.
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  20. Semantyka warunków prawdziwości i problem ekstensjonalności.Cezary Cieśliński - 1993 - Filozofia Nauki 1.
    In this essay the problem which logically equivalent sentences present to a Tarski-style truth conditional semantics is disscused. The difficulty is that we can obtain deviant theorems which follow by logic alone from our truth theory. After criticizing E.LePore's and B.Loewer's solution, an alternative way of dealing with this problem is presented, making use of the notion of a canonically proved T-theorem.
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  21.  7
    The Epistemic Lightness of Truth: Deflationism and its Logic.Cezary Cieśliński - 2017 - Cambridge University Press.
    This book analyses and defends the deflationist claim that there is nothing deep about our notion of truth. According to this view, truth is a 'light' and innocent concept, devoid of any essence which could be revealed by scientific inquiry. Cezary Cieśliński considers this claim in light of recent formal results on axiomatic truth theories, which are crucial for understanding and evaluating the philosophical thesis of the innocence of truth. Providing an up-to-date discussion and original perspectives on this central and (...)
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  22. Uwagi na temat tezy Quine'a o niezdeterminowaniu przekładu.Cezary Cieśliński - 1994 - Studia Semiotyczne 19:139-148.
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