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Pure Appl

Michael Canjar, Countable ultraproducts without CH* , Ann · 1988

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Two $\mathfrak{b}$ or not two $\mathfrak{b}$?

math.LO · 2025-07-04 · accept · novelty 7.0

The authors prove b(I) ≤ b_R(I) for every ideal I, characterize b_R(I) structurally, and show both numbers coincide for a range of definable ideals.

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  • Two $\mathfrak{b}$ or not two $\mathfrak{b}$? math.LO · 2025-07-04 · accept · none · ref 4

    The authors prove b(I) ≤ b_R(I) for every ideal I, characterize b_R(I) structurally, and show both numbers coincide for a range of definable ideals.