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Search: MSC category 54D55 ( Sequential spaces )

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1. CMB 2011 (vol 56 pp. 203)

Tall, Franklin D.
Productively Lindelöf Spaces May All Be $D$
We give easy proofs that (a) the Continuum Hypothesis implies that if the product of $X$ with every Lindelöf space is Lindelöf, then $X$ is a $D$-space, and (b) Borel's Conjecture implies every Rothberger space is Hurewicz.

Keywords:productively Lindelöf, $D$-space, projectively $\sigma$-compact, Menger, Hurewicz
Categories:54D20, 54B10, 54D55, 54A20, 03F50

2. CMB 2010 (vol 54 pp. 270)

Dow, Alan
Sequential Order Under PFA
It is shown that it follows from PFA that there is no compact scattered space of height greater than $\omega$ in which the sequential order and the scattering heights coincide.

Keywords:sequential order, scattered spaces, PFA
Categories:54D55, 03E05, 03E35, 54A20

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