The modal logic of forcing |
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Authors: | Joel David Hamkins Benedikt Lö we |
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Institution: | The Graduate Center of The City University of New York, Mathematics, 365 Fifth Avenue, New York, New York 10016 -- and -- The College of Staten Island of The City University of New York, Mathematics, 2800 Victory Boulevard, Staten Island, New York 10314 ; Institute for Logic, Language and Computation, Universiteit van Amsterdam, Plantage Muidergracht 24, 1018 TV Amsterdam, The Netherlands |
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Abstract: | A set theoretical assertion is forceable or possible, written , if holds in some forcing extension, and necessary, written , if holds in all forcing extensions. In this forcing interpretation of modal logic, we establish that if is consistent, then the ZFC-provable principles of forcing are exactly those in the modal theory . |
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Keywords: | Forcing modal logic S4 2 |
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