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Graphs and Combinatorics
Article . 1995 . Peer-reviewed
License: Springer TDM
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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
zbMATH Open
Article . 1995
Data sources: zbMATH Open
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Partitions of sets of two-fold triple systems, and their relation to some strongly regular graphs

Partitions of sets of two-fold triple systems, and their relations to some strongly regular graphs
Authors: Rudolf Mathon; Anne Penfold Street;

Partitions of sets of two-fold triple systems, and their relation to some strongly regular graphs

Abstract

A two-fold triple system (TTS) is a 2-\((v,k,2)\) design (and hence \(v \equiv 1\) or \(3 \pmod 6\)). An overlarge set of TTS, denoted by \(\text{OS(TTS} (v))\) is a set of \(v + 1\) mutually disjoint \(\text{TTS} (v)\) (i.e. they have no triple in common), each of them based on a different \(v\)-subset of a set \(X\) of cardinality \(v + 1\). The authors prove that if \(|X |= 7\), then the 84 distinct (but all isomorphic) TTS(6) based on \(X\), can be partitioned into 12 OS(TTS(6)) each containing 7 TTS(6). Moreover there exists a resolution into 84 parallel classes of the set of 1008 distinct OS(TTS(6)) based on \(X\). Using this terminology they revisit the Hoffman-Singleton graph as well as the Higman-Sims graph. They proof, using their terminology, the well-known fact that this last graph is the union of two Hoffman-Singleton graphs. The reviewer disagrees with the authors that their description of the Higman-Sims graph is the first elementary construction.

Keywords

Higman- Sims graph, Triple systems, Association schemes, strongly regular graphs, triple system, strongly regular graphs, Hoffman-Singleton graph

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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!
4
Average
Top 10%
Average
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