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zbMATH Open
Article . 2001
Data sources: zbMATH Open
Journal of Group Theory
Article . 2001 . Peer-reviewed
Data sources: Crossref
https://dx.doi.org/10.48550/ar...
Article . 2000
License: arXiv Non-Exclusive Distribution
Data sources: Datacite
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The failure of the uncountable non-commutative Specker Phenomenon

The failure of the uncountable non-commutative Specker phenomenon
Authors: Shelah, Saharon; Strüngmann, Lutz;

The failure of the uncountable non-commutative Specker Phenomenon

Abstract

Higman proved in 1952 that every free group is non-commutatively slender, this is to say that if G is a free group and h is a homomorphism from the countable complete free product (X_omega Z) to G, then there exists a finite subset F of omega and a homomorphism h:*_{i in F} Z --> G such that h=h rho_F, where rho_F is the natural map from (X_{i in omega})Z to *_{i in F}Z . Corresponding to the abelian case this phenomenon was called the non-commutative Specker Phenomenon. In this paper we show that Higman's result fails if one passes from countable to uncountable. In particular, we show that for non-trivial groups G_alpha (alpha in lambda) and uncountable cardinal lambda there are 2^{2^lambda} homomorphisms from the complete free product of the G_alpha 's to the ring of integers.

Keywords

Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations, projections, 20E06, Free nonabelian groups, Mathematics - Logic, Group Theory (math.GR), homomorphisms, Automorphisms of infinite groups, non-commutative Specker phenomenon, free products, FOS: Mathematics, free groups, Limits, profinite groups, Logic (math.LO), Mathematics - Group Theory, free complete products

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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!
3
Average
Average
Average
Green
bronze