Around {\tt cofin}

by Roslanowski and Shelah. [RoSh:1022]
Colloquium Math, 2014
We show the consistency of ``there is a nice sigma --ideal I on the reals with add(I)= omega_1 which cannot be represented as the union of a strictly increasing sequence of length omega_1 of sigma-subideals''. This answers a question by Borodulin--Nadzieja and G{l} c {a}b.

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