Exactly $n$-resolvable Topological Expansions

Details Exactly $n$-resolvable Topological Expansions Exactly $n$-resolvable Topological Expansions

2010-08-31

arxiv.org/abs/1008.5371v2

Mathematics

General Topology

Scientific paper

For $\kappa$ a cardinal, a space $X=(X,\sT)$ is $\kappa$-{\it resolvable} if $X$ admits $\kappa$-many pairwise disjoint $\sT$-dense subsets; $(X,\sT)$ is {\it exactly} $\kappa$-{\it resolvable} if it is $\kappa$-resolvable but not $\kappa^+$-resolvable. The present paper complements and supplements the authors' earlier work, which showed for suitably restricted spaces $(X,\sT)$ and cardinals $\kappa\geq\lambda\geq\omega$ that $(X,\sT)$, if $\kappa$-resolvable, admits an expansion $\sU\supseteq\sT$, with $(X,\sU)$ Tychonoff if $(X,\sT)$ is Tychonoff, such that $(X,\sU)$ is $\mu$-resolvable for all $\mu<\lambda$ but is not $\lambda$-resolvable (cf. Theorem~3.3 of \cite{comfhu10}). Here the "finite case" is addressed. The authors show in ZFC for $1

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