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2017 Nonstandard Functional Interpretations and Categorical Models
Amar Hadzihasanovic, Benno van den Berg
Notre Dame J. Formal Logic 58(3): 343-380 (2017). DOI: 10.1215/00294527-3870348


Recently, the second author, Briseid, and Safarik introduced nonstandard Dialectica, a functional interpretation capable of eliminating instances of familiar principles of nonstandard arithmetic—including overspill, underspill, and generalizations to higher types—from proofs. We show that the properties of this interpretation are mirrored by first-order logic in a constructive sheaf model of nonstandard arithmetic due to Moerdijk, later developed by Palmgren, and draw some new connections between nonstandard principles and principles that are rejected by strict constructivism. Furthermore, we introduce a variant of the Diller–Nahm interpretation with two different kinds of quantifiers, similar to Hernest’s light Dialectica interpretation, and show that one can obtain nonstandard Dialectica by weakening the computational content of the existential quantifiers—a process called herbrandization. We also define a constructive sheaf model mirroring this new functional interpretation, and show that the process of herbrandization has a clear meaning in terms of these sheaf models.


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Amar Hadzihasanovic. Benno van den Berg. "Nonstandard Functional Interpretations and Categorical Models." Notre Dame J. Formal Logic 58 (3) 343 - 380, 2017.


Received: 5 February 2014; Accepted: 28 October 2014; Published: 2017
First available in Project Euclid: 19 April 2017

zbMATH: 06761613
MathSciNet: MR3681099
Digital Object Identifier: 10.1215/00294527-3870348

Primary: 03H15
Secondary: 03F25 , 03G30

Keywords: categorical logic , Constructive mathematics , dialectica interpretation , functional interpretations , nonstandard arithmetic , proof mining

Rights: Copyright © 2017 University of Notre Dame


Vol.58 • No. 3 • 2017
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