Shelah's consistency conjecture for large sets of singular cardinals

From papers

Let θ\theta be any uncountable cardinal. Shelah's consistency conjecture for pseudopowers. It is consistent that, for some cardinal λ\lambda, both of the following hold: (A) θ{μ<λ:cf(μ)=0, pp(μ)>λ}\theta\leq\left|\{\mu<\lambda:\operatorname{cf}(\mu)=\aleph_0,\ \operatorname{pp}(\mu)>\lambda\}\right|; and (B) for some λ\lambda, the set {μ<λ:cf(μ)>0, pp1–complete(μ)>λ}\{\mu<\lambda:\operatorname{cf}(\mu)>\aleph_0,\ \operatorname{pp}_{\aleph_1\text{--complete}}(\mu)>\lambda\} is infinite. The claim concerns consistency results in pcf theory and is stated without a resolution in the paper.

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Sources & referencesView supporting material

Primary source

Saharon Shelah, “On what I do not understand (and have something to say): Part I”, arXiv:math/9906113 (1999).

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