Electronic Version 19 (1994), 335-348

Peter Vojtas

In this paper we summarize some of our former results on series, ultrafilters and cardinal characteristics in a new unified manner by Galois-Tukey connections. Using some new observations about the connection between separative factorization of the comparison ordering of divergent series and \omega^* we get a new insight into these older results. This gives a new type of characterization of points of \omega^* and a (possibly) new sort of duality.

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volume 19: table of contents
topology proceedings Electronic Version