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# HomalgToCAS

## A window to the outer world

Version 2009.11.09

November 2009

(this manual is still under construction)
This manual is best viewed as an HTML document. The latest version is available online at:
http://homalg.math.rwth-aachen.de/~barakat/HomalgToCAS/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: barakat@mathematik.uni-kl.de
Homepage: http://wwwb.math.rwth-aachen.de/~barakat/
Address:
Department of Mathematics,
University of Kaiserslautern,
67653 Kaiserslautern,
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

### Copyright

© 2007-2009 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.

### 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
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
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