Around cofin
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🧮 math.LO
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omegaanswersaroundborodulin-nadziejacannotcofinconsistencyglab
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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 Glab.
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