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Other literature type . 2002
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Topological Methods in Nonlinear Analysis
Article . 2002 . Peer-reviewed
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Lefschetz fixed point theorem for acyclic maps with multiplicity

Authors: von Haeseler, Fritz; Peitgen, Heinz-Otto; Skordev, Gencho;

Lefschetz fixed point theorem for acyclic maps with multiplicity

Abstract

The authors study so-called weighted set-valued maps (in their terminology called \(m\)-multivalued maps), i.e. compact-valued upper semicontinuous mappings \(F: X\to Y\) between compact spaces whose values are finite disjoint unions of finitely many components, acyclic with respect to the Čech homology with coefficients in a field \(\mathbb{F}\) and endowed with a weight, i.e., a \(\mathbb{F}\)-valued multiplicity function \(m\) defined on the graph of \(F\) and satisfying some regularity properties. Extending the Čech homology functor for such maps, the authors introduce the concept of Lefschetz number and investigate the transfer homomorphism. Finally, they introduce the notion of an \(\mathbb{F}\)-simplicial space (showing that, in particular, compact absolute neighborhood retracts are \(\mathbb{F}\)-simplicial) and prove a variant of the Lefschetz fixed point theorem for \(m\)-multivalued maps. The involved proof relies on the notion of a generalized weak approximative system which helps to proceed on the level of chains of homology groups. The stated and proved results generalize by far the existing Lefschetz type theorems for set-valued compact maps.

Keywords

set-valued maps, Fixed points and coincidences in algebraic topology, Fixed-point and coincidence theorems (topological aspects), transfer homomorphism, multiplicity function, Lefschetz fixed point theorem, Set-valued maps in general topology, acyclic map

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
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Average
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bronze