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Delta_1-definability of the non-stationary ideal

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Mathematical, Foundational and Computational Aspects of the Higher Infinite

The talk will be devoted to the proof of the fact that assuming $V = L$, for every successor cardinal  $kappa$ there exists a GCH and cardinal preserving forcing poset $P in L$ such that in $LP$ the ideal of all non-stationary subsets of $kappa$ is  $Delta_1$-definable over $H(kappa+)$. We shall also discuss the situation for limit $kappa$.

This talk is part of the Isaac Newton Institute Seminar Series series.

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