64 found
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  1. Good Samaritans, Contrary-to-Duty Imperatives, and Epistemic Obligations.Lennart Åqvist - 1967 - Noûs 1 (4):361-379.
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  2.  63
    Modal Logic with Subjunctive Conditionals and Dispositional Predicates.Lennart Åqvist - 1973 - Journal of Philosophical Logic 2 (1):1 - 76.
  3. A New Approach to the Logical Theory of Interrogatives: Analysis and Formalization.Lennart Åqvist - 1975 - Tbl Verlag G. Narr.
     
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  4. Improved Formulations of Act-Utilitarianism.Lennart Åqvist - 1969 - Noûs 3 (3):299-323.
    The article deals with two problems that arise within moorean style act-utilitarianism (a.u.): (i) how is the notion of 'the alternatives to' a particular action to be explicated? (ii) how should a.u. be formulated in order for it to validate the laws of standard deontic logic? it is argued that these intertwined problems can be solved only if the traditional formulations a a.u. are rejected in favor of some new and more viable ones. in the literature the two problems seem (...)
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  5. Introduction to Deontic Logic and the Theory of Normative Systems.Lennart Åqvist - 1991 - Noûs 25 (1):109-116.
     
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  6.  76
    Notes on A. J. Ayer's "The Terminology of Sense-Data".Lennart Åqvist - 1959 - Analysis 20 (5):106 - 111.
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  7.  52
    Grades of Probability Modality in the Law of Evidence.Lennart Åqvist - 2010 - Studia Logica 94 (3):307-330.
    The paper presents an infinite hierarchy PR m [ m = 1, 2, . . . ] of sound and complete axiomatic systems for modal logic with graded probabilistic modalities , which are to reflect what I have elsewhere called the Bolding-Ekelöf degrees of evidential strength as applied to the establishment of matters of fact in law-courts. Our present approach is seen to differ from earlier work by the author in that it treats the logic of these graded modalities not (...)
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  8.  83
    The Logic of Historical Necessity as Founded on Two-Dimensional Modal Tense Logic.Lennart Åqvist - 1999 - Journal of Philosophical Logic 28 (4):329-369.
    We consider a version of so called T x W logic for historical necessity in the sense of R.H. Thomason (1984), which is somewhat special in three respects: (i) it is explicitly based on two-dimensional modal logic in the sense of Segerberg (1973); (ii) for reasons of applicability to interesting fields of philosophical logic, it conceives of time as being discrete and finite in the sense of having a beginning and an end; and (iii) it utilizes the technique of systematic (...)
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  9.  54
    An Interpretation of Probability in the Law of Evidence Based on Pro-Et-Contra Argumentation.Lennart Åqvist - 2007 - Artificial Intelligence and Law 15 (4):391-410.
    The purpose of this paper is to improve on the logical and measure-theoretic foundations for the notion of probability in the law of evidence, which were given in my contributions Åqvist [ (1990) Logical analysis of epistemic modality: an explication of the Bolding–Ekelöf degrees of evidential strength. In: Klami HT (ed) Rätt och Sanning (Law and Truth. A symposium on legal proof-theory in Uppsala May 1989). Iustus Förlag, Uppsala, pp 43–54; (1992) Towards a logical theory of legal evidence: semantic analysis (...)
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  10. A New Approach to the Logical Theory of Interrogatives.Lennart Åqvist - 1965 - [Uppsala].
     
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  11.  86
    Three Characterizability Problems in Deontic Logic.Lennart Åqvist - 2000 - Nordic Journal of Philosophical Logic 5 (2):65-82.
    We consider an infinite hierarchy of systems of Alethic Modal Logic with so-called Levels of Perfection, and add to them suitable definitions of such interesting deontic categories as those of supererogation, offence, conditional obligation and conditional permission. We then state three problems concerning the proper characterization of the resulting logic(s) for our defined notions, and discuss two of these problems in some detail.
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  12.  81
    Old Foundations for the Logic of Agency and Action.Lennart Åqvist - 2002 - Studia Logica 72 (3):313-338.
    The paper presents an infinite hierarchy of sound and complete axiomatic systems for Two-Dimensional Modal Tense Logic with Historical Necessity, Agents and Acts. A main novelty of these logics is their capacity to represent formally (i) basic action-sentences asserting that such and such an act is performed/omitted by an agent, as well as (ii) causative action-sentences asserting that by performing/omitting a certain act, an agent causes that such and such a state-of-affairs is realized (e.g. comes about/ceases/remains/remains absent). We illustrate how (...)
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  13.  94
    A Solution to Moore's Paradox.Lennart Åqvist - 1964 - Philosophical Studies 15 (1-2):1 - 5.
    Moore's paradox pits our intuitions about semantic oddness against the concept of truth-functional consistency. Most solutions to the problem proceed by explaining away our intuitions. But "consistency" is a theory-laden concept, having different contours in different semantic theories. Truth-functional consistency is appropriate only if the semantic theory we are using identifies meaning with truth-conditions. I argue that such a framework is not appropriate when it comes to analyzing epistemic modality. I show that a theory which accounts for a wide variety (...)
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  14.  61
    Some Remarks on Performatives in the Law.Lennart Åqvist - 2003 - Artificial Intelligence and Law 11 (2-3):105-124.
    This paper contains an analysis of performatives with special attention to performatives in the law. It deals with the possibility to recognise performativity by means of a grammatical-syntactic criterion, the self-verifying and norm-promulgating character of legal performatives, an analysis of the effects of performatives by means of causal logic, the different forms of performativity and a theory of promise-performatives.
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  15.  45
    Deontic Tense Logic With Historical Necessity, Frame Constants, and a Solution to the Epistemic Obligation Paradox.Lennart Åqvist - 2014 - Theoria 80 (4):319-349.
    In an earlier paper by the author, Åqvist , I presented an approach to the logic of historical necessity, or inevitability, in the sense of a “two-dimensional” combination of tense and modal logic for worlds, or histories, with the same time order, known as T × W logic. Distinctive features of that approach were, apart from its two-dimensionality, its being based on discrete and finite time, and its use of so-called systematic frame constants in order to enable us to indicate (...)
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  16.  25
    Chisholm-Sosa Logics of Intrinsic Betterness and Value.Lennart Åqvist - 1968 - Noûs 2 (3):253-270.
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  17.  50
    Interpretations of Deontic Logic.Lennart Åqvist - 1964 - Mind 73 (290):246-253.
    The author is concerned with a minimal system dl of deontic logic, His main purpose being to draw attention to the existence of interpretations of dl that give rise to various systems of what may be called "atheoretical logic." by this we understand logical systems dealing with expressions that are--Very probably at least--Neither true nor false, Such as sentences expressing promises, Intentions, Wishes, Commands, And similar things. As it is well known, The status of atheoretical logic in this sense is (...)
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  18.  9
    Some Theorems About a “Tree” System of Deontic Tense Logic.Lennart Åqvist & Jaap Hoepelman - 1981 - In Risto Hilpinen (ed.), New Studies in Deontic Logic. pp. 187--221.
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  19.  49
    Some Results on Dyadic Deontic Logic and the Logic of Preference.Lennart Åqvist - 1986 - Synthese 66 (1):95 - 110.
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  20.  12
    Predicate Calculi with Adjectives and Nouns.Lennart Åqvist - 1981 - Journal of Philosophical Logic 10 (1):1 - 26.
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  21.  58
    Semantic and Pragmatic Characterizability of Linguistic Usage.Lennart Åqvist - 1967 - Synthese 17 (1):281 - 291.
  22.  5
    Combinations of Tense and Deontic Modality: On the R T Approach to Temporal Logic with Historical Necessity and Conditional Obligation.Lennart Åqvist - 2005 - Journal of Applied Logic 3 (3-4):421-460.
  23.  39
    Reflections on the Logic of Nonsense.Lennart Åqvist - 1962 - Theoria 28 (2):138-157.
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  24.  32
    Reply to Mr. Pratt.Lennart Åqvist - 1962 - Analysis 22 (6):149 - 151.
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  25.  12
    Choice-Offering and Alternative-Presenting Disjunctive Commands.Lennart Åqvist - 1965 - Analysis 25 (5):182 - 184.
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  26.  31
    Revised Foundations for Imperative-Epistemic and Interrogative Logic.Lennart Aqvist - 1971 - Theoria 37 (1):33-73.
  27.  66
    Some Logico-Semantical Themes in Karl Olivecrona's Philosophy of Law: A Non-Exegetical Approach.Lennart Åqvist - 2008 - Theoria 74 (4):271-294.
    The paper deals with certain issues with which Olivecrona was mainly concerned in his Philosophy of Law, notably (i) his views about the logical or syntactical form of imperatives as used in the law, and (ii) his views on the semantics of imperatives in the law and on the question whether and to what extent the notions of truth and falsity are applicable to those imperatives at all. In the light of an important critical notice of Olivecrona's work by Marc-Wogau (...)
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  28.  38
    Results Concerning Some Modal Systems That Contain S.Lennart Åqvist - 1964 - Journal of Symbolic Logic 29 (2):79-87.
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  29.  23
    On the Logical Syntax or Linguistic Deep Structure of Certain Crime Descriptions: Prolegomena to the Doctrine of Criminal Intent.Lennart Åqvist - 1985 - Synthese 65 (2):291 - 306.
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  30.  41
    Postulate Sets and Decision Procedures for Some Systems of Deontic Logic.Lennart åQvist - 1963 - Theoria 29 (2):154-175.
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  31.  31
    On a Supposed Tautology.Lennart Åqvist - 1962 - Analysis 22 (3):66 - 69.
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  32.  44
    Discrete Tense Logic with Infinitary Inference Rules and Systematic Frame Constants: A Hilbert-Style Axiomatization. [REVIEW]Lennart Åqvist - 1996 - Journal of Philosophical Logic 25 (1):45 - 100.
    The paper deals with the problem of axiomatizing a system T1 of discrete tense logic, where one thinks of time as the set Z of all the integers together with the operations +1 ("immediate successor") and-1 ("immediate predecessor"). T1 is like the Segerberg-Sundholm system WI in working with so-called infinitary inference ruldes; on the other hand, it differs from W I with respect to (i) proof-theoretical setting, (ii) presence of past tense operators and a "now" operator, and, most importantly, with (...)
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  33.  17
    Comments on the Paradox of Analysis.Lennart Äqvist - 1962 - Inquiry : An Interdisciplinary Journal of Philosophy 5 (1-4):260-264.
    A version of the so?called paradox of analysis is enunciated which involves two principles of synonymy, referred to respectively as that of substitution and that of triviality. It is argued that for most ?familiar? concepts of synonymy the former principle can be maintained whereas the latter one has to be rejected. I deal with some solutions to the paradox that have been proposed or discussed by Carnap, Lewy, Feyerabend and Hare, and adhere to Carnap's view that the puzzle arises from (...)
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  34.  31
    On the Logic of Causally Necessary and Sufficient Conditions: Towards a Theory of Motive-Explanations of Human Actions. [REVIEW]Lennart Åqvist - 1989 - Erkenntnis 31 (1):43 - 75.
  35.  6
    Review: Review Essay: Doing the Best We Can. [REVIEW]Lennart Åqvist - 1991 - Philosophy and Phenomenological Research 51 (1):215 - 225.
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  36.  16
    A Note on Commitment.Lennart Åqvist - 1963 - Philosophical Studies 14 (1-2):22 - 25.
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  37.  26
    Semantic Concepts of Expression.Lennart Åqvist - 1962 - Philosophy and Phenomenological Research 23 (1):89-100.
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  38.  26
    A Conjectured Axiomatization of Two-Dimensional Reichenbachian Tense Logic.Lennart Åqvist - 1979 - Journal of Philosophical Logic 8 (1):1 - 45.
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  39.  2
    The Moral Philosophy of Richard Price.D. O. Thomas & Lennart Aqvist - 1960 - Philosophical Quarterly 12 (49):367.
  40.  10
    Prima Facie Obligations in Deontic Logic: A Chisholmian Analysis Based on Normative.Lennart Aqvist - 1998 - In Christoph Fehige & Ulla Wessels (eds.), Preferences. De Gruyter. pp. 135.
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  41.  10
    Alchourrón and Bulygin on Deontic Logic and the Logic of Norm-Propositions: Axiomatization and Representability Results.Lennart Åqvist - 2008 - Logique Et Analyse 203:225-261.
  42. Performatives and Verifiability by the Use of Language.Lennart Åqvist - 1971 - Uppsala, Filosofiska Föreningen Och Filosofiska Institutionen Vid Uppsala Universitet.
     
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  43.  2
    The Logic of Commands.Lennart Åqvist - 1967 - Philosophical Books 8 (1):18-23.
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  44.  9
    Doing the Best We Can.Lennart Åqvist - 1991 - Philosophy and Phenomenological Research 51 (1):215-225.
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  45.  2
    On Some Completeness Theorems in Modal Logic.Lennart Aqvist & D. Makinson - 1970 - Journal of Symbolic Logic 35 (1):135.
  46.  3
    Review: D. Makinson, On Some Completeness Theorems in Modal Logic. [REVIEW]Lennart Aqvist - 1970 - Journal of Symbolic Logic 35 (1):135-136.
  47.  1
    Makinson D.. On Some Completeness Theorems in Modal Logic. Zeitschrift Für Mathematische Logik Und Grundlagen der Mathematik, Vol. 12 , Pp. 379–384. [REVIEW]Lennart Åqvist - 1970 - Journal of Symbolic Logic 35 (1):135-136.
  48.  2
    Solution to Chisholm's Paradox.Lennart Aqvist - 1991 - In Georg Schurz (ed.), Advances in Scientific Philosophy. pp. 24--127.
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  49. On a Supposed Tautology.Lennart Aqvist - 1962 - Erkenntnis 22 (3):66.
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  50. The Emotive Theory of Ethics in the Light of Recent Developments in Formal Semantics and Pragmatics.Lennart Aqvist - 1973 - In Sören Halldén (ed.), Modality, Morality and Other Problems of Sense and Nonsense. Lund, Gleerup. pp. 130.
     
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