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  1.  12
    Jens Erik Fenstad (2015). On What There is—Infinitesimals and the Nature of Numbers. Inquiry 58 (1):57-79.
    This essay will be divided into three parts. In the first part, we discuss the case of infintesimals seen as a bridge between the discrete and the continuous. This leads in the second part to a discussion of the nature of numbers. In the last part, we follow up with some observations on the obvious applicability of mathematics.
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  2.  1
    Jens Erik Fenstad (1980). General Recursion Theory: An Axiomatic Approach. Springer-Verlag.
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  3.  7
    Jens Erik Fenstad (1968). The Structure of Logical Probabilities. Synthese 18 (1):1 - 23.
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  4.  8
    Jens Erik Fenstad (1980). IUHPS / DLMPS Bulletin No. Synthese 43 (1):183-192.
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  5.  38
    Jens Erik Fenstad (1962). Notes on Synonymy. Synthese 14 (1):35 - 77.
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  6.  6
    Jens Erik Fenstad (1968). On the Completeness of Some Transfinite Recursive Progressions of Axiomatic Theories. Journal of Symbolic Logic 33 (1):69-76.
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  7.  4
    Jens Erik Fenstad (1996). Thoralf Albert Skolem 1887--1963 a Biographical Sketch. Nordic Journal of Philosophical Logic 1 (2):99-106.
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  8.  5
    Jens Erik Fenstad (1986). Review: H. Jerome Keisler, An Infinitesimal Approach to Stochastic Analysis. [REVIEW] Journal of Symbolic Logic 51 (3):822-824.
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  9.  19
    Jens Erik Fenstad (1985). Is Nonstandard Analysis Relevant for the Philosophy of Mathematics? Synthese 62 (2):289 - 301.
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  10.  1
    Jens Erik Fenstad (2015). Postscript to ‘On What There is—Infinitesimals and the Nature of Numbers’. Inquiry 58 (1):80-82.
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  11.  3
    Jens Erik Fenstad (1983). International Union of the History and Philosophy of Science Division of Logic, Methodology and Philosophy of Science Bulletin No. Synthese 57 (3):443-453.
  12.  3
    Jens Erik Fenstad (1959). Notes on the Application of Formal Methods in the Soft Sciences. Inquiry 2 (1-4):34 – 64.
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  13.  7
    Jens Erik Fenstad & Ernest Gellner (1958). Discussion — Reviews. Inquiry 1 (1-4):247 – 248.
    Sociology of Faith Werner Stark: The Sociology of Knowledge. The International Library of Sociology and Social Reconstruction, Routledge and Kegan Paul, London, 1958. 36s. net. 356 pp. Carnap Introduces Symbolic Logic Rudolph Carnap: Introduction to Symbolic Logic and its Applications, Dover Publication, New York 1958, $1.85, 241 pp.
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  14.  1
    Jens Erik Fenstad & Tore Langholm (1988). Review: Fred Landman, Towards a Theory of Information, The Status of Partial Objects in Semantics. [REVIEW] Journal of Symbolic Logic 53 (2):656-657.
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  15.  5
    Jens Erik Fenstad (1978). Critical Notices. Synthese 38 (1):169-173.
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  16.  1
    Jens Erik Fenstad (2004). Tarski, Truth and Natural Languages. Annals of Pure and Applied Logic 126 (1-3):15-26.
    The first part of the paper traces the history of the relationship between logic and linguistics with particular emphasis on the contributions of Tarski and Ajdukiewicz. In the second part we give a brief review of current work on formal semantics for natural language systems and argue for the need for a richer geometric structure on the semantic model space.
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  17.  0
    Sergio Albeverio & Jens Erik Fenstad (1990). Nonstandard Methods in Stochastic Analysis and Mathemetical Physics. Journal of Symbolic Logic 55 (1):362-363.
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  18.  0
    Jens Erik Fenstad (1970). A Note on Standard Versus Non-Standard Topology. Journal of Symbolic Logic 35 (2):344-344.
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  19. Jens Erik Fenstad (1958). Discussion of Rudolph Carnap: Introduction to Symbolic Logic and its Applications. Inquiry 1:254.
     
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  20.  1
    Jens Erik Fenstad, R. O. Gandy & Gerald E. Sacks (eds.) (1978). Generalized Recursion Theory Ii: Proceedings of the 1977 Oslo Symposium. Sole Distributors for the U.S.A. And Canada, Elsevier North-Holland.
    GENERALIZED RECUBION THEORY II © North-Holland Publishing Company (1978) MONOTONE QUANTIFIERS AND ADMISSIBLE SETS Ion Barwise University of Wisconsin ...
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  21.  2
    Jens Erik Fenstad & Peter G. Hinman (eds.) (1974). Generalized Recursion Theory. New York,American Elsevier Pub. Co..
    Provability, Computability and Reflection.
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  22.  9
    Jens Erik Fenstad, Ivan Timofeevich Frolov & Risto Hilpinen (eds.) (1989). Logic, Methodology, and Philosophy of Science Viii: Proceedings of the Eighth International Congress of Logic, Methodology, and Philosophy of Science, Moscow, 1987. Sole Distributors for the U.S.A. And Canada, Elsevier Science.
    The volume contains 37 invited papers presented at the Congress, covering the areas of Logic, Mathematics, Physical Sciences, Biological Sciences and the ...
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  23.  0
    Jens Erik Fenstad (1959). Notes on Normative Logic. Journal of Symbolic Logic 24 (3):247-248.
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  24.  9
    Jens Erik Fenstad (ed.) (1971). Proceedings of the Second Scandinavian Logic Symposium. Amsterdam,North-Holland Pub. Co..
    Provability, Computability and Reflection.
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  25.  0
    Jens Erik Fenstad (1974). Review: Harvey M. Friedman, Determinateness in the Low Projective Hierarchy. [REVIEW] Journal of Symbolic Logic 39 (3):599-599.
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  26.  0
    Jens Erik Fenstad (1974). The Axiom of Determinateness. Journal of Symbolic Logic 39 (2):331-332.
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  27.  0
    Michael Gelfond, Vladimir Lifschitz, Robert A. Kowalski, Kenneth A. Bowen, Kit Fine & Jens Erik Fenstad (1992). The Stable Model Semantics for Logic Programming. Journal of Symbolic Logic 57 (1):274-277.
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  28.  0
    John G. Kemeny, Stephen Ullmann & Jens Erik Fenstad (1970). A New Approach to Semantics. Journal of Symbolic Logic 35 (2):310-312.
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  29.  0
    Thoralf Skolem, C. C. Chang & Jens Erik Fenstad (1967). Bemerkungen Zum Komprehensionsaxiom. Journal of Symbolic Logic 32 (1):128-129.
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