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  1.  39
    After All, There Are Some Inequalities Which Are Provable in ZFC.Tomek Bartoszyński, Andrzej Roslanowski & Saharon Shelah - 2000 - Journal of Symbolic Logic 65 (2):803-816.
    We address ZFC inequalities between some cardinal invariants of the continuum, which turned out to be true in spite of strong expectations given by [11].
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  2.  12
    Ideals Without CCC.Marek Balcerzak, Andrzej Roslanowski & Saharon Shelah - 1998 - Journal of Symbolic Logic 63 (1):128-148.
    Let I be an ideal of subsets of a Polish space X, containing all singletons and possessing a Borel basis. Assuming that I does not satisfy ccc, we consider the following conditions (B), (M) and (D). Condition (B) states that there is a disjoint family F $\subseteq$ P(X) of size c, consisting of Borel sets which are not in I. Condition (M) states that there is a Borel function f: X → X with $f^{-1}[\{x\}] \not\in$ I for each x ∈ (...)
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  3.  11
    Generating Ultrafilters in a Reasonable Way.Andrzej Roslanowski & Saharon Shelah - 2008 - Mathematical Logic Quarterly 54 (2):202-220.
    We continue investigations of reasonable ultrafilters on uncountable cardinals defined in Shelah [8]. We introduce a general scheme of generating a filter on λ from filters on smaller sets and we investigate the combinatorics of objects obtained this way.
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