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- W2034946468 abstract "We explore an application of homological algebra to set theoretic objects by developing a cohomology theory for Hausdorff gaps. This leads to a natural equivalence notion for gaps about which we answer questions by constructing many simultaneous gaps. The first result is proved in ZFC while new combinatorial hypotheses generalizing ♣ are introduced to prove the second result. The cohomology theory is introduced with enough generality to be applicable to other questions in set theory. Additionally, the notion of an incollapsible gap is introduced and the existence of such a gap is shown to be independent of ZFC." @default.
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- W2034946468 title "Applications of cohomology to set theory I: Hausdorff gaps" @default.
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- W2034946468 doi "https://doi.org/10.1016/0168-0072(94)00020-4" @default.
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