The topological structure of (homogeneous) spaces and groups with countable cs*-character

Details The topological structure of (homogeneous) spaces and groups with countable cs*-character The topological structure of (homogeneous) spaces and groups with countable cs*-character

2009-11-20

arxiv.org/abs/0911.4075v1

Appl. Gen. Top. 5:1 (2004), 25--48

Mathematics

General Topology

Scientific paper

In this paper we introduce and study three new cardinal topological invariants called the cs*, cs-, and sb-characters. The class of topological spaces with countable cs*-character is closed under many topological operations and contains all aleph-spaces and all spaces with point-countable cs*-network. Our principal result states that each non-metrizable sequential topological group with countable cs*-character has countable pseudo-character and contains an open $k_\omega$-subgroup.

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