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# HomalgToCAS

## A window to the outer world

Version 2020.10-02

September 2015

(this manual is still under construction)
This manual is best viewed as an HTML document. The latest version is available online at:
https://homalg-project.github.io/homalg_project/HomalgToCAS/doc/chap0.html
An offline version should be included in the documentation subfolder of the package.
This package is part of the homalg-project:
http://homalg.math.rwth-aachen.de/index.php/core-packages/homalgtocas

Mohamed Barakat
Email: mohamed.barakat@uni-siegen.de
Homepage: https://mohamed-barakat.github.io
Address:
Department of Mathematics,
University of Siegen,
57072 Siegen,
Germany

Thomas Breuer
Email: sam@math.rwth-aachen.de
Homepage: http://www.math.rwth-aachen.de/~Thomas.Breuer/
Address:
Lehrstuhl D für Mathematik, RWTH-Aachen,
Templergraben 64
52062 Aachen
Germany

Simon Görtzen
Email: simon.goertzen@rwth-aachen.de
Homepage: http://wwwb.math.rwth-aachen.de/goertzen/
Address:
Lehrstuhl B für Mathematik, RWTH-Aachen,
Templergraben 64
52062 Aachen
Germany

Frank Lübeck
Email: frank.luebeck@math.rwth-aachen.de
Homepage: http://www.math.rwth-aachen.de/~Frank.Luebeck/
Address:
Lehrstuhl D für Mathematik, RWTH-Aachen,
Templergraben 64
52062 Aachen
Germany

Vinay Wagh
Email: waghoba@gmail.com
Homepage: http://www.iitg.ernet.in/vinay.wagh/
Address:
E-102, Department of Mathematics,
Indian Institute of Technology Guwahati,
Guwahati, Assam, India.
PIN: 781 039.

### Copyright

© 2007-2015 by Mohamed Barakat, Thomas Breuer, Simon Görtzen, and Frank Lübeck.

This package may be distributed under the terms and conditions of the GNU Public License Version 2 or (at your option) any later version.

### Acknowledgements

We are very much indebted to Max Neunhöffer who provided the first piece of code around which the package IO_ForHomalg was built. The package HomalgToCAS provides a further abstraction layer preparing the communication.

### Contents

1 Introduction
1.1 HomalgToCAS provides ...
2 Installation of the HomalgToCAS Package
3 Watch and Influence the Communication
3.1 Functions
3.1-1 homalgIOMode
3.2 The Pictograms
3.2-1 HOMALG_IO.Pictograms
4 External Rings
4.1 External Rings: Representation
4.1-1 IsHomalgExternalRingRep
4.2 Rings: Constructors
4.3 External Rings: Operations and Functions
A Overview of the homalg Package Source Code
References
Index
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