Anti-admissible sets

Journal of Symbolic Logic 64 (2):407-435 (1999)
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Abstract

Aczel's theory of hypersets provides an interesting alternative to the standard view of sets as inductively constructed, well-founded objects, thus providing a convienent formalism in which to consider non-well-founded versions of classically well-founded constructions, such as the "circular logic" of [3]. This theory and ZFC are mutually interpretable; in particular, any model of ZFC has a canonical "extension" to a non-well-founded universe. The construction of this model does not immediately generalize to weaker set theories such as the theory of admissible sets. In this paper, we formulate a version of Aczel's antifoundation axiom suitable for the theory of admissible sets. We investigate the properties of models of the axiom system KPU - , that is, KPU with foundation replaced by an appropriate strengthening of the extensionality axiom. Finally, we forge connections between "non-wellfounded sets over the admissible set A" and the fragment L A of the modal language L ∞

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References found in this work

The Liar: An Essay on Truth and Circularity.Vann McGee - 1991 - Philosophical Review 100 (3):472.
Non-Well-founded Sets.J. L. Bell - 1989 - Journal of Symbolic Logic 54 (3):1111-1112.

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