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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao https://doi.org/10.1...arrow_drop_down
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Homogeneous Geometries

Homogeneous geometries
Authors: Evans, David;

Homogeneous Geometries

Abstract

The main purpose of the paper is to provide an elementary proof of the following theorem: An infinite, non-degenerate, locally finite, homogeneous geometry is a projective or affine geometry over a finite field. This result was previously proved by \textit{G. Cherlin}, \textit{L. Harrington} and \textit{A. H. Lachlan} in Appendix 2 to their paper in Ann. Pure Appl. Logic 28, 103-135 (1985; Zbl 0566.03022) using the classification of finite primitive Jordan groups. Another proof of the theorem independent on the theory of Jordan groups can be found in the series of papers by \textit{B. I. Zil'ber} [see e.g. Sib. Math. J. 21, 219- 230 (1980); translation from Sib. Mat. Zh. 21, No.2, 98-112 (1980; Zbl 0486.03017); and Sov. Math., Dokl. 24, 149-151 (1981); translation from Dokl. Akad Nauk SSSR 259, 1039-1041 (1981; Zbl 0485.51004)]. The author's proof is elementary in the sense that the only point at which a substantial group-theoretic result is used is at the end of the proof, where the results of \textit{P. J. Cameron} and \textit{W. M. Kantor} [J. Algebra 60, 384-422 (1979; Zbl 0417.20044)] are used to show that a nondegenerate finite homogeneous geometry of sufficiently large dimensions is a projective or affine geometry over a finite field, possibly truncated. For further details the reader is referred to the paper itself.

Related Organizations
Keywords

projective geometry, General theory of linear incidence geometry and projective geometries, non-degenerate, locally finite, homogeneous geometry, affine geometry over a finite field, Finite automorphism groups of algebraic, geometric, or combinatorial structures, Linear incidence geometric structures with parallelism, Combinatorial aspects of finite geometries

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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
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