Possible PCF algebras
AbstractThere exists a family of sets of countable ordinals such that:(1) max Bα = α,(2) if α ∈ Bβ then Bα ⊆ Bβ,(3) if λ ≤ α and λ is a limit ordinal then Bα ∩ λ is not in the ideal generated by the Bβ, β < α, and by the bounded subsets of λ,(4) there is a partition of ω1 such that for every α and every n, Bα ∩ An is finite.
1970 ◽
Vol 28
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pp. 174-175
1974 ◽
Vol 32
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pp. 330-331
1978 ◽
Vol 36
(1)
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pp. 222-223
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1978 ◽
Vol 36
(1)
◽
pp. 100-101
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1994 ◽
Vol 52
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pp. 992-993
Keyword(s):