Forcings with the countable chain condition and the covering number of the Marczewski ideal

Archive for Mathematical Logic 42 (7):695-710 (2003)
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Abstract

We prove that the covering number of the Marczewski ideal is equal to ℵ1 in the extension with the iteration of Hechler forcing

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10.1007/s00153-003-0174-2

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Increasing the groupwise density number by c.c.c. forcing.Heike Mildenberger & Saharon Shelah - 2007 - Annals of Pure and Applied Logic 149 (1-3):7-13.

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