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The $\pi$-weights and $\pi$-characters of hyperspaces with the hit-and-miss topologies

Hou, Ji-Cheng
1998
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Abstract
We prove that $\pi w\left(\Delta\left(x\right)\right)=\pi\chi\left(\Delta\left(x\right)\right)=\textrm{max}\left\{ \pi w\left(x\right),\tau k\left(\Delta\right)\right\} $ for the hit-and-miss topologies $\tau\Delta$ on the closed subsets of either a quasi-regular and $\mathbf{R}_{0}$ or $T_{1}$ space $\left(X,\tau\right)$, where $\tau k\left(\Delta\right)$ is a cardinal invariant associted with $\Delta$.
Archivio
http://hdl.handle.net/10077/4353
Diritti
open access
Soggetti
  • Hyperspace

  • hit-and-miss topology...

  • $\pi$-weights

  • $\pi$-characters

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