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CARDINALITY OF INVERSE LIMITS WITH UPPER SEMICONTINUOUS BONDING FUNCTIONS

Part of: Maps and general types of spaces defined by maps Basic constructions Fairly general properties

Published online by Cambridge University Press:  23 September 2014

MATEJ ROŠKARIČ  and
NIKO TRATNIK
MATEJ ROŠKARIČ
Affiliation:
Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška 160, Maribor 2000, Slovenia email [email protected]
NIKO TRATNIK*
Affiliation:
Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška 160, Maribor 2000, Slovenia email [email protected]
*
✉[email protected]
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Abstract

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We explore the cardinality of generalised inverse limits. Among other things, we show that, for any $n\in \{ℵ_{0},c,1,2,3,\dots \}$, there is an upper semicontinuous function with the inverse limit having exactly $n$ points. We also prove that if $f$ is an upper semicontinuous function whose graph is a continuum, then the cardinality of the corresponding inverse limit is either 1, $ℵ_{0}$ or $c$. This generalises the recent result of I. Banič and J. Kennedy, which claims that the same is true in the case where the graph is an arc.

Keywords

continualimitsinverse limitscardinalityupper semicontinuous set-valued functions

MSC classification

Primary: 54C60: Set-valued maps
Secondary: 54B10: Product spaces 54D80: Special constructions of spaces (spaces of ultrafilters, etc.)
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 91 , Issue 1 , February 2015 , pp. 167 - 174
Copyright
Copyright © 2014 Australian Mathematical Publishing Association Inc. 

References

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