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2018 | OriginalPaper | Buchkapitel

A Category of “Undirected Graphs”

A Tribute to Hartmut Ehrig

verfasst von : John L. Pfaltz

Erschienen in: Graph Transformation, Specifications, and Nets

Verlag: Springer International Publishing

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Abstract

In this paper, a category of undirected graphs is introduced where the morphisms are chosen in the style of mathematical graph theory rather than as algebraic structures as is more usual in the area of graph transformation.
A representative function, \({\omega }\), within this category is presented. Its inverse, \({\omega }^{-1}\), is defined in terms of a graph grammar, \({\varepsilon }\).

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Fußnoten
1
The codomain \(2^{V'}\) of f need not be \(2^V\), and its edge set \(E'\) need not have the same structure as E. Therefore, elements of the codomain are denoted with a prime.
 
2
We use suffix notation to denote the application of set-valued operators and functions.
 
3
This is a common terminology, but unfortunately such “closed neighborhoods” are not “closed”. The intersection of closed sets must be closed, but it easy to show that this is seldom true with “closed neighborhoods”.
 
4
We modify the usual definition of monotonicity to read: \(X \subseteq Y\) implies \(X.f \subseteq Y.f\), provided https://static-content.springer.com/image/chp%3A10.1007%2F978-3-319-75396-6_12/464263_1_En_12_IEq60_HTML.gif .
 
5
This procedure has been quite effective reducing large graphs \(| V | \ge 1,000\), with at worst 6 iterative sweeps of V.
 
6
A graph, \(K_n\) is complete if all n nodes are mutually connected by an edge.
 
7
Because extreme points are simplicial (neighborhood is a clique), and because every chordal graph must have at least two extreme points [8, 9], every chordal graph can be so generated.
 
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Metadaten
Titel
A Category of “Undirected Graphs”
verfasst von
John L. Pfaltz
Copyright-Jahr
2018
DOI
https://doi.org/10.1007/978-3-319-75396-6_12

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