Preservativity logic: An analogue of int
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Rosalie Iemhoff
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Article
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2003
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John Wiley and Sons
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English
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## Abstract In this paper we study the modal behavior of ฮฃโpreservativity, an extension of provability which is equivalent to interpretability for classical superarithmetical theories. We explain the connection between the principles of this logic and some wellโknown properties of HA, like the disj