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Digraphs

Version 1.5.3

Jan De Beule
Email: jdebeule@cage.ugent.be
Homepage: http://homepages.vub.ac.be/~jdbeule

Julius Jonušas
Email: julius.jonusas@tuwien.ac.at
Homepage: http://julius.jonusas.work

James D. Mitchell
Email: jdm3@st-and.ac.uk
Homepage: https://jdbm.me

Maria Tsalakou
Email: mt200@st-andrews.ac.uk
Homepage: https://mariatsalakou.github.io

Wilf A. Wilson
Email: gap@wilf-wilson.net
Homepage: https://wilf.me

Michael C. Young
Email: mct25@st-andrews.ac.uk
Homepage: https://mct25.host.cs.st-andrews.ac.uk

Marina Anagnostopoulou-Merkouri

Finn Buck

Stuart Burrell

Reinis Cirpons

Tom Conti-Leslie

Luke Elliott

Ewan Gilligan

Max Horn

Christopher Jefferson

Markus Pfeiffer

Lea Racine

Christopher Russell

Finn Smith

Ben Spiers

Murray White

Abstract

The Digraphs package is a GAP package containing methods for graphs, digraphs, and multidigraphs.

Copyright

© 2014-22 by Jan De Beule, Julius Jonušas, James D. Mitchell, Wilf A. Wilson, Michael Young et al.

Digraphs is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

Acknowledgements

We would like to thank Christopher Jefferson for his help in including bliss in Digraphs. This package's methods for computing digraph homomorphisms are based on work by Max Neunhöffer, and independently Artur Schäfer.

Contents

1 The Digraphs package
2 Installing Digraphs
3 Creating digraphs
 3.3 New digraphs from old
4 Operators
5 Attributes and operations
6 Properties of digraphs
7 Homomorphisms
8 Finding cliques and independent sets
9 Visualising and IO
A Grape to Digraphs Command Map
References
Index

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