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Seminar of the Department of Mathematical Logic "Proof Theory"
April 4, 2016, Moscow, Steklov Mathematical Institute of RAS, Conference Hall (8 Gubkina), Moscow
 


On Feferman's second conjecture

Michael Rathjen

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Abstract: In addition to his conjecture about the indeterminacy of CH relative to semi-intuitionistic set theory, Feferman stated another conjecture concerning the relationship between two types of predicates in such set theories, namely that the collection of $\Delta_1$ predicates and the collection of predicates for which the law of excluded middle holds should coincide. The talk will address this conjecture.

Language: English

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