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Bases and selectors for tall families. (arXiv:1710.08766v1 [math.LO])
来源于:arXiv
We show that the Nash-Williams theorem has a uniform version and that the
Galvin theorem does not. We show that there is an $F_\sigma$ tall ideal on
$\mathbb{N}$ without a Borel selector and also construct a $\mathbf\Pi^1_2$
tall ideal without a tall closed subset. 查看全文>>
