Geodesic
$\Delta _1$-Definability of the non-stationary ideal at successor cardinals
Sy-David Friedman 1   ; Liuzhen Wu 1   ; Lyubomyr Zdomskyy 1
1 Kurt Gödel Research Center for Mathematical Logic University of Vienna Währinger Straße 25 A-1090 Wien, Austria
Fundamenta Mathematicae, Tome 229 (2015) no. 3, pp. 231-254 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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Assuming $V=L$, for every successor cardinal $\kappa $ we construct a GCH and cardinal preserving forcing poset $\mathbb {P}\in L$ such that in $L^{\mathbb {P}}$ the ideal of all non-stationary subsets of $\kappa $ is $\Delta _1$-definable over $H(\kappa ^{+})$.
DOI : 10.4064/fm229-3-2
Keywords: assuming every successor cardinal kappa construct gch cardinal preserving forcing poset mathbb mathbb ideal non stationary subsets kappa delta definable kappa

Sy-David Friedman  1   ; Liuzhen Wu  1   ; Lyubomyr Zdomskyy  1

1 Kurt Gödel Research Center for Mathematical Logic University of Vienna Währinger Straße 25 A-1090 Wien, Austria 
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Sy-David Friedman; Liuzhen Wu; Lyubomyr Zdomskyy. $\Delta _1$-Definability of the non-stationary ideal at successor cardinals. Fundamenta Mathematicae, Tome 229 (2015) no. 3, pp. 231-254. doi: 10.4064/fm229-3-2

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