# A null ideal for inaccessibles

A null ideal for inaccessibles In this paper we introduce a tree-like forcing notion extending some properties of the random forcing in the context of $$2^\kappa$$ 2 κ , $$\kappa$$ κ inaccessible, and study its associated ideal of null sets and notion of measurability. This issue was addressed by Shelah (On CON(Dominating $$\_$$ _ lambda $$\,>\,$$ > cov $$\_\lambda$$ _ λ (meagre)), arXiv:0904.0817 , Problem 0.5) and concerns the definition of a forcing which is $$\kappa ^\kappa$$ κ κ -bounding, $$<\kappa$$ < κ -closed and $$\kappa ^+$$ κ + -cc, for $$\kappa$$ κ inaccessible. Cohen and Shelah (Generalizing random real forcing for inaccessible cardinals, arXiv:1603.08362 ) provide a proof for (Shelah, On CON(Dominating $$\_$$ _ lambda $$\,>\,$$ > cov $$\_\lambda$$ _ λ (meagre)), arXiv:0904.0817 , Problem 0.5), and in this paper we independently reprove this result by using a different type of construction. This also contributes to a line of research adressed in the survey paper (Khomskii et al. in Math L Q 62(4–5):439–456, 2016). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archive for Mathematical Logic Springer Journals

# A null ideal for inaccessibles

, Volume 56 (6) – Jun 19, 2017
7 pages

/lp/springer_journal/a-null-ideal-for-inaccessibles-45Gxer9meT
Publisher
Springer Berlin Heidelberg
Subject
Mathematics; Mathematical Logic and Foundations; Mathematics, general; Algebra
ISSN
0933-5846
eISSN
1432-0665
D.O.I.
10.1007/s00153-017-0562-7
Publisher site
See Article on Publisher Site

### Abstract

In this paper we introduce a tree-like forcing notion extending some properties of the random forcing in the context of $$2^\kappa$$ 2 κ , $$\kappa$$ κ inaccessible, and study its associated ideal of null sets and notion of measurability. This issue was addressed by Shelah (On CON(Dominating $$\_$$ _ lambda $$\,>\,$$ > cov $$\_\lambda$$ _ λ (meagre)), arXiv:0904.0817 , Problem 0.5) and concerns the definition of a forcing which is $$\kappa ^\kappa$$ κ κ -bounding, $$<\kappa$$ < κ -closed and $$\kappa ^+$$ κ + -cc, for $$\kappa$$ κ inaccessible. Cohen and Shelah (Generalizing random real forcing for inaccessible cardinals, arXiv:1603.08362 ) provide a proof for (Shelah, On CON(Dominating $$\_$$ _ lambda $$\,>\,$$ > cov $$\_\lambda$$ _ λ (meagre)), arXiv:0904.0817 , Problem 0.5), and in this paper we independently reprove this result by using a different type of construction. This also contributes to a line of research adressed in the survey paper (Khomskii et al. in Math L Q 62(4–5):439–456, 2016).

### Journal

Archive for Mathematical LogicSpringer Journals

Published: Jun 19, 2017

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