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==Preliminaries==
 
==Preliminaries==
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There are several ways to formalize the subject matter of relations.  Relations and their combinations may be described in the logic of relative terms, in set theories of various kinds, and through a broadening of category theory from functions to relations in general.
    
The first order of business is to define the operation on [[relation (mathematics)|relations]] that is variously known as the ''composition of relations'', ''relational composition'', or ''relative multiplication''.  In approaching the more general constructions, it pays to begin with the composition of dyadic and triadic relations.
 
The first order of business is to define the operation on [[relation (mathematics)|relations]] that is variously known as the ''composition of relations'', ''relational composition'', or ''relative multiplication''.  In approaching the more general constructions, it pays to begin with the composition of dyadic and triadic relations.
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===Focal nodes===
 
===Focal nodes===
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* [[Inquiry Live]]
 
* [[Inquiry Live]]
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* [[Logic Live]]
 
* [[Logic Live]]
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===Peer nodes===
 
===Peer nodes===
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* [http://intersci.ss.uci.edu/wiki/index.php/Relation_composition Relation Composition @ InterSciWiki]
 
* [http://intersci.ss.uci.edu/wiki/index.php/Relation_composition Relation Composition @ InterSciWiki]
 
* [http://mywikibiz.com/Relation_composition Relation Composition @ MyWikiBiz]
 
* [http://mywikibiz.com/Relation_composition Relation Composition @ MyWikiBiz]
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* [http://ref.subwiki.org/wiki/Relation_composition Relation Composition @ Subject Wikis]
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* [http://en.wikiversity.org/wiki/Relation_composition Relation Composition @ Wikiversity]
 
* [http://beta.wikiversity.org/wiki/Relation_composition Relation Composition @ Wikiversity Beta]
 
* [http://beta.wikiversity.org/wiki/Relation_composition Relation Composition @ Wikiversity Beta]
* [http://ref.subwiki.org/wiki/Relation_composition Relation Composition @ Subject Wikis]
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===Logical operators===
 
===Logical operators===
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Portions of the above article were adapted from the following sources under the [[GNU Free Documentation License]], under other applicable licenses, or by permission of the copyright holders.
 
Portions of the above article were adapted from the following sources under the [[GNU Free Documentation License]], under other applicable licenses, or by permission of the copyright holders.
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* [http://intersci.ss.uci.edu/wiki/index.php/Relation_composition Relation Composition], [http://intersci.ss.uci.edu/ InterSciWiki]
 
* [http://intersci.ss.uci.edu/wiki/index.php/Relation_composition Relation Composition], [http://intersci.ss.uci.edu/ InterSciWiki]
 
* [http://mywikibiz.com/Relation_composition Relation Composition], [http://mywikibiz.com/ MyWikiBiz]
 
* [http://mywikibiz.com/Relation_composition Relation Composition], [http://mywikibiz.com/ MyWikiBiz]
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* [http://semanticweb.org/wiki/Relation_composition Relation Composition], [http://semanticweb.org/ Semantic Web]
 
* [http://semanticweb.org/wiki/Relation_composition Relation Composition], [http://semanticweb.org/ Semantic Web]
 
* [http://ref.subwiki.org/wiki/Relation_composition Relation Composition], [http://ref.subwiki.org/ Subject Wikis]
 
* [http://ref.subwiki.org/wiki/Relation_composition Relation Composition], [http://ref.subwiki.org/ Subject Wikis]
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* [http://en.wikiversity.org/wiki/Relation_composition Relation Composition], [http://en.wikiversity.org/ Wikiversity]
* [https://beta.wikiversity.org/wiki/Relation_composition Relation Composition], [https://beta.wikiversity.org/ Wikiversity Beta]
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* [http://beta.wikiversity.org/wiki/Relation_composition Relation Composition], [http://beta.wikiversity.org/ Wikiversity Beta]
 
* [http://en.wikipedia.org/w/index.php?title=Relation_composition&oldid=43467878 Relation Composition], [http://en.wikipedia.org/ Wikipedia]
 
* [http://en.wikipedia.org/w/index.php?title=Relation_composition&oldid=43467878 Relation Composition], [http://en.wikipedia.org/ Wikipedia]
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[[Category:Combinatorics]]
 
[[Category:Combinatorics]]
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